Identify the sentence that correctly uses the indefinite article.

‘Amateur’ is a noun which refers to a person who takes part in an activity as a hobby or for pleasure and not as a job.

‘Amateur’ is a noun which refers to a person who takes part in an activity as a hobby or for pleasure and not as an job.

‘Amateur’ is a noun which refers to an person who takes part in an activity as a hobby or for pleasure and not as a job.

‘Amateur’ is a noun which refers to a person who takes part in a activity as a hobby or for pleasure and not as a job.