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.
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Both apocrine and eccrine sweat glands use merocrine secretion, where vesicles in the gland released sweat via exocytosis, leaving the entire cell intact.
Kelvin is waiting for James. it is from Kelvin's perspective... he is clearly worried about someone who is going to turn up. James is the only person who is named.
Each of them want to kill the other treachery