Answer:
The correct option is 1.
Explanation:
Let the cost price of one shirt be s and the cost price of one pair pants is p.
Suzy buys 2 shirts and 2 pairs of pants for 42 dollars at the store. It means

Annette buys 3 shirts and 1 pair of pants for 37 dollars. It means

The system of equation is defined as
.... (1)
.... (2)
On solving (1) and (2), we get
p=13, s=8
Therefore the correct option is 1.