A small circular coil of 20 loops of wire having a radius of 1 cm is at rest in the x-y plane (so the normal to the loop

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A small circular coil of 20 loops of wire having a radius of 1cm is at rest in the x-y plane (so the normal to the loop points inthe +z-direction). A uniform magnetic field of 0.5 T isturned on in the +x-direction.
What is the magnetic flux through the loop?
a. 3.14×10−3 T m2
b. 0 T m2
c. 1.57× 10−4 T m2
d. 7.85×10−5 T m2