For the block diagram of the given figure, the equation describing system dynamics is

• A. (1 + RCs) Δθ0(s) = Δθi(s) + R Δ H(s)
• B. (1 + RCs) [ΔH(s)] = Δθ(s) - Δθ0(s)
• C. (1 + RCs) Δθ0(s) = RΔ H(s) - Δ θi(s)
• D. (1 + RCs) Δθi(s) = Δ H(s)[R] - Δθ0(s)