In a coil of resistance $100 \mathrm{\Omega }$, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is:

• A

  $275 \mathrm{Wb}$
• B

  $200 \mathrm{Wb}$
• C

  $225 \mathrm{Wb}$
• Correct answer
  D

  $250 \mathrm{Wb}$

Hence, the correct answer is option: 'D'.