Correct Option: D

By using Manson’s gain formula for signal flow graph.
Here,
P₁ = 2 × 3 × 4 = 24
P₂ = 5
Δ₁ = 1
Δ₂ = 1 – (– 3) = 4
Δ = 1 – (sum of individual loop T. F.) + (sum of loop transmittance products of all possible pairs)
= 1 – (– 2 – 3 – 4 – 5) + (– 2x – 4)
= 1 + 14 + 8
= 23

T.F. =	C	=	P1Δ1 + P2Δ2
	R		Δ

=	24 × 1 + 5 × 4
	23

=	44
	23

Hence alternative (D) is the correct choice.