Why does winston doubt reality in chapter 7, book 1 of 1984?

Everyone lives in misery and fear. At that point, Winston believes he may be fantasizing, believing and seeing things that are not really there, because the only official record is from The Party. Winston suspects that history to be false, but then begins to doubt himself.

b. they require a huge investment of time, dedication ,training, and patience almost from the day they are born.

explanation:

the sentence gives a clear evidence of how carefully the sar dogs are selected and also specify from what time this exercise begins."almost from the day they are are born." this sentence shows as that this exercise begins early.

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i would say the answer is erm c but if you dont agree im so sorry