MHT CET Physics question

with the decreases of current in the primary coil from 2 ampere to zero value in 0.01 second, the e.m.f. generated in the secondary coil is 1000 Volt. The mutual inductance of the two coil is

• (A)1.25 Henry
• (B)2.50 Henry
• (C)5.00 HenryCorrect
• (D)10.00 Henry