Which sentence includes a participial phrase?

A. Would you help our planning the trip?
B. Staring down the mountain, Jack was excited for a day of skiing
C. I would like to go to the new mountain resort
D. I looked in the closet for my sweater

B. Staring down the mountain, Jack was excited for a day of skiing.

To identify a participial phrase in a sentence, we need to look for a verb form that ends in '-ing' or '-ed' and functions as an adjective. Let's analyze each of the options provided:

A. "Would you help our planning the trip?" - This sentence does not include a participial phrase. It is a question, but there is no verb form ending in '-ing' or '-ed' functioning as an adjective.

B. "Staring down the mountain, Jack was excited for a day of skiing." - This sentence includes a participial phrase. The verb form "staring" is functioning as an adjective describing Jack. It tells us how Jack was at that moment.

C. "I would like to go to the new mountain resort." - This sentence does not include a participial phrase. It consists of a simple statement without any verb form ending in '-ing' or '-ed' functioning as an adjective.

D. "I looked in the closet for my sweater." - This sentence does not include a participial phrase. It is a simple sentence with the verb form "looked," but it is not used as an adjective.

Therefore, the sentence that includes a participial phrase is B. "Staring down the mountain, Jack was excited for a day of skiing."

The sentence that includes a participial phrase is B. "Staring down the mountain, Jack was excited for a day of skiing."