The prepositional phrase in the sentence is "during the drought," since it consists of the preposition "during" and the complement "the drought," as seen below.
A prepositional phrase is a group of words that does NOT possess a subject and a verb. It contains a preposition and a complement. Examples of prepositions are:
The complement usually contains a noun or a pronoun, but it can also contain other categories of words.
Having that in mind, we can easily see that the prepositional phrase in the sentence provided in the question is "during the drought," since it consists of the preposition "during" and the complement "the drought."
With the information above in mind, we can conclude that the answer provided above is correct.
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