which word in the following sentence is an indefinite article?

A camera can also catch people who cause problems.

A.a
B.can(i picked this)but i know its wrong.
C.also
D.who

please help me

"can" is a verb.

"also" is an adverb.

"who" is a pronoun.

What's left??

Yes!

http://grammar.ccc.commnet.edu/grammar/determiners/determiners.htm

TTHANKS

You're welcome!

In order to find the indefinite article in the sentence, you need to understand what an indefinite article is. An indefinite article is a word that introduces a non-specific noun and can be either "a" or "an." In the given sentence, the word "a" is the indefinite article because it introduces the non-specific noun "camera."

So, the correct answer is A. "a".