I didn’t buy the underlined phrase in the sentence upon arriving at the science lab Sarah eagerly prepared her experiment for the upcoming demonstration

Gerund
Participle
Prepositional
Appositive

Gerund

The underlined phrase "upon arriving at the science lab" in the sentence is a participle.

The underlined phrase in the sentence "upon arriving at the science lab" is a participle.

To identify the type of phrase, we first need to understand what a participle is. A participle is a verb form that functions as an adjective, modifying a noun or pronoun. Participles can end in "-ing" (present participle) or "-ed" or "-en" (past participle). In this case, the participle is "arriving," which is the present participle form of the verb "arrive."

To determine if the underlined phrase is a participle, we can ask ourselves if it is describing or modifying a noun. In this sentence, "arriving" describes the subject "Sarah" and explains what she did when she reached the science lab. It tells us the action Sarah was performing, which is preparing her experiment. Therefore, "arriving" is functioning as an adjective and modifying the noun "Sarah."

So, in this case, the correct answer is "participle."