Answer:

The correct option is b)

Explanation:

The induced emf is represented by:

Here, $N$ is the number of turns of the coil, $A$ is the area of the coil, and $B$ is the strength of the magnetic field.
$$
\begin{aligned}
&i=\frac{e}{N R} \\
&i=-\frac{N A}{N R} \frac{d(B)}{d t} \\
&i=-\frac{A}{R} \frac{d(B)}{d t}
\end{aligned}
$$
The above expression is independent of the number of turns.