The second choice: p+s=14 and 12.5p+4s=107. This is because the articles of clothing (p representing pants and s representing shirts) are supposed to equal 14, which is what our first equation is. Our second equation aims to find how many shirts and pants were bought that made it equal to 107. We don't know how many shirts or pants there are, but we know that a certain number of shirts (times the cost of 12.5) plus a certain number of pants (times the cost of 4) will equal 107. This translates into the equation 12.5p+4s=107. Since the second choice has BOTH of these answers, that is your correct answer.
:)