The answer is us. Us is a singular pronoun
A would be the correct answer. The suffix has to be perceived as speech in order to have a effect on memory performance
In literary criticism, stream<span> of </span>consciousness<span>, also known as interior monologue, is a narrative mode or device that depicts the multitudinous thoughts and feelings which pass through the mind. So it is (b).</span>
An abstract word are things like feelings, ideas, concepts and qualities