Read this excerpt from the land, part 4. if it makes no difference," i said, "then just go ahead and mess up and end up not going. you figure you want to go, though, then you treat those horses like you always do, and you keep your temper, even around your daddy." mitchell didn't say anything. he just gave me a look and walked away, but i knew i'd gotten to him. how does mitchell ensure that he is invited on the trip with paul and paul’s father? by keeping his temper in check in front of paul’s father by convincing paul to ask him to go with them by doing extra work with paul’s father’s horses by talking to paul’s father about the trip

The answer to the following question: read this excerpt from the land, part 4. if it makes no difference," i said, "then just go ahead and mess up and end up not going. you figure you want to go, though, then you treat those horses like you always do, and you keep your temper, even around your daddy." mitchell didn't say anything. he just gave me a look and walked away, but i knew i'd gotten to him.  how does mitchell ensure that he is invited on the trip with paul and paul’s father? by keeping his temper in check in front of paul’s fatherby convincing paul to ask him to go with themby doing extra work with paul’s father’s horsesby talking to paul’s father about the tripis: by talking to paul’s father about the trip

Use who. if it wasn't a question, you could put the he in the blank.  if you can put he or she in the blank, it's who.if you can put him or her in the blank, it's whom.