Answer:
O 4. It acts as an adjective because it describes the noun "group."
Explanation:
Participial phrases
The phrase "excited about the sale" consists of a participle and its complements, which makes it a participial phrase. This type of phrase functions as an adjective, which means it modifies a noun in the sentence.
In this case, the noun being modified is "group". The phrase is providing additional information about the group of shoppers that arrived early.