In which sentence is the underlined word a preposition?

a.)when production increases, prices go down(down is underlined).

b.)some experiments are best performed outside(outside is underlined).

c.)outside we’ll have a better chance of seeing the stars(outside is underlined).

d.)place the refuse down the garbage chute(down is underlined).

The correct answer is D). In sentence, the underlined word, which is "down", is a preposition.

In sentence D. ("Place the refuse down the garbage chute"), "down" is a preposition because it is followed by a noun ("the garbage chute"). On the other hand, "down" in sentence A. is not a preposition since it is not followed by a noun.  Moreover, although "outside" can be a preposition, in sentences B. and C. "outside" is an adverb because it is not followed by a noun.

anxious,the clues in the question suggest he was embarrassed and anxious about boo radley.