Hyperbole is the answer or idiom
I would guess up.
Is there anyone up for a drink after work?
I've heard it before.
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.
A clause has a subject and a verb, so
1) "parade" "began"
2) "she" "loves"
3) "she" "went"
4)
5) "today" "rained"
so by this logic 4 wouldn't be a clause because it has no identifiable subject or verb