Am i correct?

My work
0.10/0.20= .5 = 1/2 or is it the other way around? .20/.10?

Suppose a magnetic field of 0.20 T is applied to the area within a circular loop of wire. The strength of the field is then changed to 0.10 T. By what factor is the magnetic flux changed?

A. 2

B. 4

C. 1/2 <----

D. 1/4