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

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;

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by limiting types of goods produced