The children were excited ______ their trip to the zoo.

• A. To
• B. About
• C. On
• D. For

Answer: (D)

The main idea here is how we pair emotions with prepositions to show what the feeling is directed toward. When someone is excited about a future event, we often use for to express that anticipation about the event itself.

In this sentence, the trip to the zoo is the upcoming event. Saying they are excited for their trip communicates that they’re looking forward to the trip and feel positive anticipation about it. Using for focuses the excitement on the event that will happen, not just on the idea of the trip in general.

Other options don’t fit as well. To would be used with an infinitive (excited to go…), which isn’t the structure here. On isn’t used with this adjective in this context. About is natural and possible, but the nuance here is best captured by for, highlighting anticipation of the forthcoming trip itself.