The answer is the last one.
the first question is wrong because it would’ve referred Justin as “his” & not “their” because he is a male.
the second question is wrong because art supplies are more than one thing, they are an entire bunch. it would’ve referred the art supplies as “they were” & not “it was”.
the third question is wrong because the volunteers aren’t just one individual, it’s more than one individual. they would’ve been referred to as “their tools” & not “his or her tools”.
the fourth answer is right because it refers the team as more than one individual, using “them” & not “him or her”.
