Which person is considered part of a market?
a. abe, who is talking to his friends.
b. cassie, who is taking photographs to put in an album.
c. isi, who is teaching himself how to play golf ?
d. trinia, who is planning what to buy at the grocery store.

Narrowly it is Trinia (over Cassie). She is planning to spend money which will go to a seller.

Explanation:

Quick answer Trinia.

Isi isn't paying anyone to teach him to play golf. We presume he has golf clubs.

Cassie is probably the second best answer. She will need to get her pictures developed which will mean the exchange of money

Abe is doing nothing that is useful to society in terms of money.

answer; in small towns;

answer; emotional intelligence (ei);