Which group of words in this sentence is a clause? When World War II broke out, Bearden served in the U. S. Army.

Answer: The group of words that is a clause in the sentence is: When World War II broke out.

Explanation:

The clause in any sentence is a group of words that will tell the reader what the sentence is about. In this case, it is when World War II broke out. In the clause, there will be a verb that explains to the reader what the sentence is about.

There are four types of clauses in sentences;

Relative Clause Noun Clause Independent Clause Dependent Clause