Read the excerpt from "the love song of j. alfred prufrock."

and indeed there will be time
to wonder, “do i dare? ” and, “do i dare? ”
time to turn back and descend the stair,
with a bald spot in the middle of my hair —
(they will say: “how his hair is growing thin! ”)
my morning coat, my collar mounting firmly to the chin,
my necktie rich and modest, but asserted by a simple pin —
(they will say: “but how his arms and legs are thin! ”)
do i dare
disturb the universe?
in a minute there is time
for decisions and revisions which a minute will reverse.

which words best indicate that prufrock feels uncertain?
a. disturb, universe, minute
b. turn back, revisions, reverse
c. time, descend, asserted
d. modest, simple, thin