B) to assure himself of its truth
The options given have you take a closer look at the words it's and himself. Option C changes "himself" to "hisself". "Hisself" is never correct. This means we have to decide if the correct answer is "its" or "it's". "Its", without an apostrophe, is the possessive form showing ownership. "It's", with an apostrophe, is a contraction meaning "it is". Let's plug them into the sentence "of it is truth" does not make any sense. Can "it" own truth? Yes, so "its" is the correct answer.
The phrase "remembering the days when he would have gone outside" is describing the man. Participial phrases always have a participial, in this case remembering and have gone, and these phrases act like adjectives to describe the subject on the sentence. The answer is participial phrase.
In Flowers for Algernon, Charlie and Algernon are both connected. Algernon was the first to "become smart," and Charlie followed. The reader knows from the beginning that their fates are intertwined; what happens to Algernon happens, at some point, to Charlie.
Algernon and Charlie both had their intelligence increased, and both became abnormally intelligent. Algernon and Charlie enjoy a bond that is both a deep connection and a symbolic relationship. In a literary sense, Algernon symbolizes Charlie.
As Charlie becomes smarter, he sees the connection as well. He understands that Algernon's behavior foreshadows his own fate. Therefore, when Algernon's behavior alters, Charlie knows that it is more than likely to happen to him as well. Thankfully, Charlie is so smart at this point that he is in a position to try and delay any changes from happening to himself. That's why he begins to work so intensely. With his great mind, Charlie is attempting to find any way he can to stop the changes from occurring within his own mind.
Sadly, of course, Charlie learns that it is not possible. His great intelligence could not save him from his fate, a fate that mirrors that of Algernon. Both were allowed only a brief moment of glory, despite the best efforts of those who tried to make this brief moment last.
I know this may start controversy but it's not oppressed if they don't know they're oppressed. But if being abused then let them free yes, but on the terms of being oppressed then no.