Hello!
Let's multiply the length by the width first, so that we know how big the frame is. Then we can compare it to the other frame dimensions:
A = l × w
A = 30 × 24
A = 720
Now we know how big the frame is: 720 in²
Let's create frames using the dimensions from options A, B, C, and D. The frame has to be smaller in size, meaning it has to have an area less than 720 in²:
Option A:
A = l × w
A = 20 × 25
A = 500 in²
Option B:
A = l × w
A = 15 × 8
A = 120 in²
Option C:
A = l × w
A = 24 × 18
A = 432 in²
Option D:
A = l × w
A = 15 × 12
A = 180 in²