Answer: adjectival phrase
Explanation:
An adjectival phrase refers to a group of words that is used to describe a noun or a pronoun in a sentence. Ir should be noted that the adjective can appear at the beginning of the phrasez at the middle or at the end of the phrase.
Here, the "stimulus" is used tongue further information about the experiment. Therefore, the correct option is C.
The type of phrase or clause that is actually underlined in the sentence is: adjectival phrase.
An adjectival phrase is actually known to be a group of words that actually include an adjective which modifies a noun or pronoun in a sentence. This type of phrase is used to describe people, place, things, etc.
We can see that the adjectival phrase here is describing the experiment that caused plants to grow.
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