Answer:
About 15
Step-by-step explanation:
The first two rows up from the bottom each contain 7 squares
The next row (3rd one up) is about 6 1/2
The fourth one up is about 5
The 5th one from the bottom is about 3
The total number is 7 + 7 + 6 1/2 + 5 + 3 = 28 1/2 squares.
Now what does that mean? Each square is 1/2 unit in the x direction by 1 unit in the y direction. The area of 1 "square" looking block is 1/2 * 1 = 1/2 unit^2
Since the number of squares on the graph = about 30 each one with an area of 1/2 unit^2, the answer should be 15.
The question is so intent on tricking you, it does not make clear what it wants. My answer is the second one down but don't be surprised if it is C
