The structure "in the morning before school" is a phrase, since it does not contain a subject or a predicate in order to be considered a clause, as seen below.
We can define a phrase as a group of words that can be a part of a sentence, but that is not a clause in itself. Phrases do not have some essential components that would form a clause and convey a complete thought, such as a subject and predicate.
That is why the structure "in the morning before school" cannot be considered a clause. It does not have a subject or a predicate. This group of words is just a phrase, therefore.
With the information above in mind, we can conclude that the answer provided above is correct.
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