One Hundred Turns of Insulated Copper Wire Are Wrapped Around $\Omega$

One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100 m².The circuit is completed by connecting the coil to a 10- $\Omega$ resistor.As the magnetic field along the coil axis changes from 1.00 T in one direction to 1.00 T in the other direction, the total charge that flows through the resistor is:

A) 0.01 C
B) 0.02 C
C) 0.2 C
D) 1 C
E) 2 C