"Because I am the oldest, my father has told me first, and now it is my turn to tell the others. I will have to explain why we can't play. I will have to tell them to be quiet today." In paragraph 2, the reader can infer that "the others” to whom the narrator must explain why we can't play" and who must be quiet today” refers to – A) her entire family
B) her father's family
C)her neighborhood friends
D) her younger siblings

Infinitive Phrase:  to spend the afternoon tobogganing.

Use: As an adverb.

Explanation:

An infinitive phrase is a verb phrase that contains the word "to" + the base form of the verb. This means that an infinitive phrase is a phrase with the construction "to+ V1 + modifiers".

In the given sentence "Tom ad Tim decided to spend the afternoon tobogganing", the infinitive phrase is "to spend the afternoon tobogganing". Here, the "to+V1" form is the infinitive that describes what the subjects "Tom and Tim" are doing or decided to do.

And the infinitive phrase in this sentence acts as an adverb as it describes the verb. The easiest way to identify an infinitive phrase as an adverb is if the sentence answers the question "where, when, why, how, for what reason" etc.

Thus, the correct answers are

Infinitive Phrase:  to spend the afternoon tobogganing.

Use: As an adverb.