[单选题]
The flux through a coil changes fr, s1o5sn)teq3 onn4mia0x sg+r+fi2jomdsrv 3 z:5t2ix $4.0 \times 10^{-5} \; Wb$ to $5.0 \times 10^{-5} \; Wb$ in 0.10 s. What $emf$ is induced in this coil?
A. $5.0 \times 10^{-4} \; V$
B. $4.0 \times 10^{-4} \; V$
C. $1.0 \times 10^{-4} \; V$
D. none of the given answers