After one year, a worker's salary is increased by 6.2%, which means in the first year one can be paid $29000, and in the next, 1.062*29000=$30798.
You can eliminate C and D, since both those graphs show that the starting salary is $5000.
You can also eliminate B because after the first year, the graph suggests a worker gets paid around $45000.
So the answer must be A.
