A compound sentence is a sentence with two clauses separated by a conjunction, but the two clauses should make sense on their own.
The 1st sentence is a complex sentence. The second is a simple sentence. The third one has a 'My cousin took us to Target' 'then to Chic Fil A' separated by a conjunction 'and' but the second clause doesn't make sense on its own. The fourth sentence has a 'You can go to the movies' and is separated by a conjunction 'or' 'you can go to Skyzone' and both clauses make sense on their own, therefore it is the compound sentence you are looking for.
Explanation: the mood of a character in a story is the attitude of the character towards a situation of another character. In the given excerpt from "Mending Wall" the speaker has a playful mood towards his neighbour and the situation where he was asked to build a wall, and he doesn't understand what is the point. To express his point of view he asks questions and he has a playful attitude.
