In the sentence, "The overly excited children rushed into the front room with coloring books and new crayons," the adjectival phrase is "overly excited."
Explanation:
1. An adjectival phrase is a group of words that functions as an adjective to describe a noun or pronoun.
2. In this sentence, the phrase "overly excited" describes the children, telling us more about their state of being.
3. Adjectival phrases can appear before or after the noun they describe, as seen in this sentence where "overly excited" comes before the noun "children."
4. The other options provided in the sentence do not function as adjectival phrases:
- "rushed into" is a verb phrase.
- "new crayons" and "coloring books" are noun phrases.
- "the front room" is a noun phrase that acts as an object of the preposition "into."
Therefore, the correct adjectival phrase in the sentence is "overly excited."