First you should know the formula to find circumference of a circle:
C = 2πr
where C is the circumference and r is the radius.
We want to find the area of the circle which is A = πr^2. Thus to find the area, we need to know the radius of the circle.
Now let's plug in the value we know and solve to find the radius:
42 in = 2πr
21 in = πr
r ≈ 6.7 in
Now we plug this value in to the area formula:
A = π(6.7 in)^2
A = π(44.89 in^2)
A ≈ 141.03 in^2
Thus the answer is A.