A simple sentence:

A) Can be reversed and still mean the same thing.
B) Expresses one complete thought with one subject and one predicate.
C) Expresses one or more complete thoughts with one or more subjects and one or more predicates.
D) Is easy to understand.
My answer is C

It's either B or C -- depending upon how one subject and one predicate are defined.

For instance: This simple sentence has a compound subject and a compound predicate.

Logan and his girlfriend ate dinner and then saw a movie.

Actually, the correct answer is B) An A simple sentence expresses one complete thought with one subject and one predicate.

To understand why A, C, and D are not correct, let's break down the options:

A) Can be reversed and still mean the same thing.
While some sentences can be reversed and still retain their meaning (e.g., "I am happy" and "Happy am I"), it is not a defining characteristic of a simple sentence. Many simple sentences cannot be reversed and maintain the same meaning.

C) Expresses one or more complete thoughts with one or more subjects and one or more predicates.
This option describes a compound or complex sentence, where you have multiple complete thoughts expressed with multiple subjects and predicates. A simple sentence, on the other hand, only expresses one complete thought with one subject and one predicate.

D) Is easy to understand.
While simple sentences are generally easier to understand compared to complex or compound sentences, this characteristic alone does not accurately define a simple sentence. The complexity or ease of understanding a sentence is subjective and can vary from person to person.

Therefore, the correct answer is B) An A simple sentence expresses one complete thought with one subject and one predicate.