Sometime during the 1950s, rock music permanently

A．Jazz is the most important musical contribution of the linked States to world culture.
This statement is in "general" , and is not undermining the author's claim that Rock was superior at a particular decade.

B．Although some young people who attended nightclubs in the 1950"s did try to listen to jazz, they eventually became bored with it.
This statement may be able to slightly explain the reaction of the youth to Rock, but can't explain why the youth used to go outside of the club when Jazz act began

C．Since the 1960" s, rock music has not only provided youths with recreation but has, as well, become a rallying point for making social statements.
This statement is concerned with what happened after the 1950s, while our scope is the 1950s period.

D．Although by 1960 jazz performances were less popular, there has since been a revival of interest in jazz among middle-class professionals.
This statement is in agreement with the facts in the author's stimulus that the popularity of Jazz declined, however, wasn't totally ousted because although it lost the interest of the youth at this stage, it gained the interested of another society segment, which is the middle-class professionals

E．Jazz steadily increased in popularity between the 1930"s and the 1950"s.[/quote]
This statement is concerned with what happened before the 1950s, while our scope is the 1950s period.

I guess there are some typing errors in answer choice C and D. It does not make sense to discuss year 1960 in answer choices when the argument is set in the back drop of year 1950. So I will assume that it is 1950 in the answer choices as well.
Lets simplify the argument.
Youths going to nightclubs listened to rock music and ignored jazz.
From this the argument jumps to conclusion that rock has ousted jazz.
Flaw: Just because youths do not prefer jazz does not mean that jazz is no longer heard.
Lets scan the answer choices
A. General statement. Does not help.
B. This actually further strengthens the conclusion that people got bored with jazz. Incorrect.
C. Strengthens again. Incorrect.
D. Correct. This option says middle class professionals are still interested in jazz. So jazz is not completwly ousted.
E. What happenned between 1930 and 1950 is irrelevant.
D is correct.

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Thesis: "Sometime during the 1950's, rock music permanently ousted jazz from the music scene."

This option does not directly disagree with the thesis -- this material is irrelevant

This option actually SUPPORTS the thesis by expanding on the author's evidence, stating that young people were bored with jazz. It does not disagree with the claim that rock music is more popular than jazz.

The option SUPPORTS the thesis, stating that rock music has remained popular -- it does not mention the popularity of jazz.

This option states that while rock music may have been more popular in the 1950s (up to the year 1960), some people are still interested in jazz. Therefore, it still has place in the "music scene.

This is irrelevant -- we are looking at the timeframe post-1960.

D is the correct answer.

Sometime during the 1950s, rock music permanently ousted jazz from the music scene. This is evident from the behavior. of youths of that time. In crowded nightclubs they would applaud rock acts enthusiastically. But when a jazz act began, they went outside and got refreshments. They came back in only when the jazz set was finished. Which of the following statements, if true, is a valid objection to the conclusion drawn above？

this was straight forward .. conclusion - during 1950 jazz out because of rock music ..
weaken - 1) jazz was not out because of rock music or
2) jazz was not out in 1950 ..this again would establish that rock music was not the reason for jazz out .

A．Jazz is the most important musical contribution of the linked States to world culture.

B．Although some young people who attended nightclubs in the 1950"s did try to listen to jazz, they eventually became bored with it.

C．Since the 1960" s, rock music has not only provided youths with recreation but has, as well, become a rallying point for making social statements.

D．Although by 1960 jazz performances were less popular, there has since been a revival of interest in jazz among middle-class professionals.- only this option correctly tells that in 1960 but not 1950 the jazz was less popular not OUT and still even in that time there was some specific group which revived the music . this clearly helps us tell that jazz was not out because of rock specially in 1950 .

E．Jazz steadily increased in popularity between the 1930"s and the 1950"s.[/quote]

Sometime during the 1950s, rock music permanently ousted jazz from the music scene. This is evident from the behavior. of youths of that time. In crowded nightclubs they would applaud rock acts enthusiastically. But when a jazz act began, they went outside and got refreshments. They came back in only when the jazz set was finished. Which of the following statements, if true, is a valid objection to the conclusion drawn above？

A．Jazz is the most important musical contribution of the linked States to world culture.

B．Although some young people who attended nightclubs in the 1950"s did try to listen to jazz, they eventually became bored with it.

C．Since the 1960" s, rock music has not only provided youths with recreation but has, as well, become a rallying point for making social statements.

D．Although by 1960 jazz performances were less popular, there has since been a revival of interest in jazz among middle-class professionals.

E．Jazz steadily increased in popularity between the 1930"s and the 1950"s.

Only D and E are contenders. E looses out for it is not covering the comparison aspect of the two genres. D, on the other hand, gives a reference towards rise of popularity of jazz.

Answer D.