$A$ long solenoid of radius $R$ carries a time $(t)$-dependent current $I(t) = I_{0} t(1-t)$. $A$ ring of radius $2R$ is placed coaxially near its middle. During the time interval $0 \leq t \leq 1$,the induced current $(I_{R})$ and the induced $EMF$ $(V_{R})$ in the ring change as

• A
  At $t = 0.5$,the direction of $I_{R}$ reverses and $V_{R}$ is zero.
• B
  The direction of $I_{R}$ remains unchanged and $V_{R}$ is zero at $t = 0.25$.
• C
  The direction of $I_{R}$ remains unchanged and $V_{R}$ is maximum at $t = 0.5$.
• D
  At $t = 0.25$,the direction of $I_{R}$ reverses and $V_{R}$ is maximum.