The easiest way to remember is Superlative or “super” is the best, right? Therefore, superlative is -est, like best, largest, greatest. Comparative is the -er. Therefore, that is more, larger, or greater. The answer, then, is B, as C simply and adjective this is neither comparative nor superlative.
Option B, Down
Mom has to descend the basement stairs.
You can get rid of <em>down</em>, because the word <em>descend</em> means to go down.
