IMO C.
Pat has concluded her statement by saying that Japanese did not fear ninjas despite of the fact that ninjas were trained assassins.
Tam is opposing pat by saying that it's not true. Now what's not true? that Japanese were not fearing Ninjas.
And she goes on giving an example of wealthy people and the roof of their houses, doubting that atleast few people(wealthy ones) were fearing Ninjas.
Now, what should Pat say to highlight the flaw in Tam's statement?
Pre thinking:
Clearly Tam has taken a small sample of wealthy people and based on that she is concluding that Japanese were fearing Ninjas. So Pam will say huh.....Wealthy people were just 1% of total population so based on that you can't conclude that most of the Japanese were fearing Ninjas.
(A) Many poor Japanese during the Tokugawa period also had houses constructed with intentionally squeaky floors.
--This one is sneaky as it's making you believe that Since poor people also made the squeaky roofs, the similar roofs made by rich people doesn't guarantee that Japanese were fearing Ninjas. But at the same time it's also possible that even poor people were afraid of Ninjas and therefore they made the squeaky roofs. Out.
(B) As part of their secret training, ninjas learned to walk on squeaky floors without making a sound.
--This one is another great option. This one says that Ninjas could walk on squeaky floors without making any sound and therefore making you believe that ohh...since Ninjas can walk on squeaky floors that means wealthy people wasted their money in making the squeaky floors as Ninjas would enter their houses any ways and therefore Tam is wrong. But, here is the catch. This statement is not proving that Japanese were not afraid of Ninjas. If I tell you Ninjas could break in even if you have ninja proof floor, then you will become more afraid of ninjas...correct. So this option is not correct.
(C) The wealthy made up a small portion of Japan's population during the Tokugawa period.
This one matches our pre thinking. Hence it's correct.
(D) The fighting prowess of ninjas was exaggerated to mythic proportions in the years following the Tokugawa period.
--Not relevant really
(E) There were very few ninjas at any time other than during the Tokugawa period.
--Count of Ninjas was not an issue.