$(A)\;1600\; and\; 80 V \\ (B)\;1800\; and\;1350V \\ (C)\; 2000\; and\;1800V \\ (D)\;1400\;and\; 200V $

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$V= V_0 e^{-t/cR}$

=> $ 2400 =3200 e^{-1/cR}$

=> $ e^{-1/Rc}=\large\frac{3}{4}$

For $t=2s$

$V= 3200 e^{-2/RC}$

$\qquad= 3200 \bigg( \large\frac{3}{4} \bigg) \bigg( \large\frac{3}{4} \bigg) $

$\qquad= 1800 V$

For $t=3s$

$V= 3200 e^{-3/RC}$

$\qquad= 3200 \bigg( \large\frac{3}{4} \bigg)^3$

$\qquad= 1350 V$

Hence B is the correct answer.

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