Although both B and C would support the argument, I believe the correct answer in this case would be A.
The superlative (or highest) form of small is smallest.
Answer:
Chimamanda Ngozi Adichie Commencement Speech to the American University... From my poetry and years before when I began writing stories as a kid in little notebooks. ... And spellings, which means the text messages don't count. ... When you've been immersed in reading here at the AU for the last few years.
