Signals and Systems - Engineering

Q1:

Consider the following sets of values of E, R and C for the circuit in the given figure.
  1. 2 V, 1 Ω, 1.25 F
  2. 1.6 V, 0.8 Ω, 1 F
  3. 1.6 V, 1 Ω, 0.8 F
  4. 2 V, 1.25 Ω, 1 F
Which of these of values will ensure that the state equation is valid?

A 1 and 4

B 1 and 2

C 3 and 4

D 2 and 3

ANS:D - 2 and 3

Can someone describe it how?