Choose the term that describes the type of sentence shown.

The senior class took a trip to Washington, D.C. and Annapolis for their research project.

A Compound
B Simple
C Complex
D Compound-Complex

I think its C Correct me if I am wrong.

The senior class took a trip to Washington, D.C. and Annapolis for their research project.

A Compound
B Simple
C Complex
D Compound-Complex

The sentence you provided consists of two independent clauses, "The senior class took a trip to Washington, D.C." and "Annapolis for their research project." These clauses are connected by the coordinating conjunction "and."

To identify the type of sentence, we can look at the structure of the clauses and how they are related.

A simple sentence contains only one independent clause and no dependent clauses.
A compound sentence consists of two or more independent clauses that are typically connected by a coordinating conjunction such as "and," "but," or "or."
A complex sentence contains one independent clause and at least one dependent clause.
A compound-complex sentence consists of two or more independent clauses and at least one dependent clause.

In this case, since we have two independent clauses connected by the coordinating conjunction "and," the correct term that describes the type of sentence is A, Compound. So your initial choice was correct.

No, sorry.

https://www.espressoenglish.net/english-sentence-structure-4-types-of-english-sentences/

class | took | trip

The prepositional phrase (to Washington, D.C. and Annapolis) modifies "took."

The prepositional phrase (for their research project) modifies "took."

Nope. I see only one subject and one verb.