Guys please discuss and provide explanations..

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D for me. OA?
Why not C: The music is intended to echo the stage directions. But C says music can have effect on stage directions.

Posting the question here again for easy reference..
With explanations for the answer.

Some critics argue that an opera’s stage directions are never reflected in its music. Many comic scenes in Mozart’s operas, however, open with violin phrases that sound like the squeaking of changing scenery. Clearly Mozart intended the music to echo the sounds occurring while stage directions are carried out. Hence, a change of scenery—the most basic and frequent stage direction—can be reflected in the music, which means that other operatic stage directions can be as well.

In the argument, the statement that many comic scenes in Mozart’s operas open with violin phrases that sound like the squeaking of changing scenery is offered in support of the claim that

(A) a change of scenery is the stage direction most frequently reflected in an opera’s music
(B) an opera’s stage directions are never reflected in its music
(C) an opera’s music can have an effect on the opera’s stage directions
(D) a variety of stage directions can be reflected in an opera’s music
(E) the most frequent relation between an opera’s music and its stage directions is one of musical imitation of the sounds that occur when a direction is carried out

EXPLANATION:
Option B is the complete opposite answer, i think you have to read the question stimulus in more detail.

Premises:
1. some critics say opera’s stage directions are never reflected in its music.

2.Clearly Mozart intended the music to echo the sounds occurring while stage directions are carried out

this states that Mozart made to echo the sounds by directing while at stage, and it is not known to the opera musicians before.

Conclusion:
Hence, a change of scenery—the most basic and frequent stage direction—can be reflected in the music, which means that other operatic stage directions can be as well.

Now read the Question, "many comic scenes in Mozart’s operas open with violin phrases that sound like the squeaking of changing scenery is offered in support of the claim " the authour states an example about mozart to disprove the critics' argument.

The conclusion clearly states that "Change of scenery"(one of the stage direction) can be refelected in an opera's music, similarly other stage directions can also be reflected in an opera’s music. So clear D.

A. Not given in the stimulus, not relevant for the question asked.

B. Stimulus clearly states that it can be reflected.

C. This is the reverse of what the stimulus states.

D. Correct

E. The most frequent relation is not mentioned in the stimulus.

Hope this helps.

Some critics argue that an opera’s stage directions are never reflected in its music. Many comic scenes in Mozart’s operas, however, open with violin phrases that sound like the squeaking of changing scenery. Clearly Mozart intended the music to echo the sounds occurring while stage directions are carried out. Hence, a change of scenery—the most basic and frequent stage direction—can be reflected in the music, which means that other operatic stage directions can be as well.

Here critics argue that operas STAGE DIRECTIONS (PLURAL) are never reflected in its music. Then followed by example which contradict previous sentence (Showed by "HOWEVER") by saying that open with violin phrases that sound like the squeaking of changing scenery. AUthor wants to prove that stage directions are (plural) reflected in Opera music by giving a example (singular). We have to find answer choice, showing that varity of stage directions happens in opera music. Let move on to answer choices

In the argument, the statement that many comic scenes in Mozart’s operas open with violin phrases that sound like the squeaking of changing scenery is offered in support of the claim that

(A) a change of scenery is the stage direction most frequently reflected in an opera’s music
Incorrect: Its talking about only change in scenary reflection in opera music but answer should show numbers of stage direction as mentioned in first sentence of argument.
(B) an opera’s stage directions are never reflected in its music
Incorrect: Just opposite of answer choice
(C) an opera’s music can have an effect on the opera’s stage directions
Incorrect: Can have means possibility.. It can be or can be not, but we required confirmed answer choice.
(D) a variety of stage directions can be reflected in an opera’s music
Correct: Mention about number of stage direction.
(E) the most frequent relation between an opera’s music and its stage directions is one of musical imitation of the sounds that occur when a direction is carried out
Incorrect: out of the way