Which answer is closest to the magnitude of the flux change?
$$
\begin{array}{l}{\text { (a) } 1 \times 10^{-4} \mathrm{T} \cdot \mathrm{m}^{2}} \\ {\text { (c) } 3 \times 10^{-7} \mathrm{T} \cdot \mathrm{m}^{2}}\end{array}
\begin{array}{l}{\text { (b) } 2 \times 10^{-6} \mathrm{T} \cdot \mathrm{m}^{2}} \\ {\text { (d) } 5 \times 10^{-8} \mathrm{T} \cdot \mathrm{m}^{2}}\end{array}
$$