Which of the following is a complex sentence?

A. She was invited to the party, but she had already made other plans.

B. He wasn’t hungry because he had a late lunch.

C. The dog followed her around the apartment all day long.

D. Initially, the conference seemed unimportant, but he was glad he attended.

so its A

B is right.

He wasn't hungry because he had a late lunch.

Mrs. Sue is confusing compounf and complex... Dont listen to her

To determine which of the following sentences is a complex sentence, we need to understand what a complex sentence is.

A complex sentence is made up of an independent clause and one or more dependent clauses. An independent clause can stand alone as a sentence, while a dependent clause cannot.

Now let's analyze the options:

A. "She was invited to the party, but she had already made other plans."
This sentence contains two independent clauses ("She was invited to the party" and "she had already made other plans") connected by the coordinating conjunction "but." Therefore, this sentence is a compound sentence, not a complex sentence.

B. "He wasn’t hungry because he had a late lunch."
This sentence consists of an independent clause "He wasn't hungry" and a dependent clause "because he had a late lunch." The dependent clause cannot stand alone as a sentence, so this sentence is a complex sentence.

C. "The dog followed her around the apartment all day long."
This sentence is a simple sentence because it contains only one independent clause and no dependent clauses. Therefore, it is not a complex sentence.

D. "Initially, the conference seemed unimportant, but he was glad he attended."
This sentence also consists of two independent clauses ("Initially, the conference seemed unimportant" and "he was glad he attended") connected by the coordinating conjunction "but." Therefore, like option A, this sentence is a compound sentence, not a complex sentence.

In conclusion, the correct answer is B. "He wasn’t hungry because he had a late lunch" is a complex sentence.

No. Please review these kinds of sentences.

Nope. D has two independent clauses.