Options are missing;
A. gerund B. participle
C. infinitive D. appositive
Answer:
“sing in the choir” is infinitive
Step-by-step explanation:
A phrase or word is considered an infinitive if the whole verb is prefixed by the particle "to".
An example is "to sing in the choir" as used in the sentence.
The infinitive is considered the most basic dictionary form of a verb whenever it is used non-finitely, with or without the particle to.
In a nutshell, an infinitive always starts with the word “to” and is followed by the base form of the verb.