Correct Option: C

The given circuit

Applying superposition theorem.
Case 1: When 60V source is taken, the equivalent circuit of the given circuit becomes.

R_eq = 10 + {20 || (10 + 20 || 10)}

or Req = 10 +		20 ||	50
			3

or Req = 10 +	20 ×	50
		3
	20 +	50
		3

=	210	= Ω
	11

Ieq =	V	=	60	=	60 × 11	=	22	A
	VReq		210/11		210		7

Let the current in the branch AB be I₁, then

I1 = Iq ×	20
	20 +	50
		3

or I1 =	22	×	3 × 20	=	12	=	= 1.71 A (A to B)
	7		110		7

Case 2: When 15 A source is taken, the equivalent circuit of the given circuit becomes.

Let the current in the branch BA be I₂.

Where, R₁ = (10||20+10)||20
or R₁ = 100/7 Ω

IR1 = 15 ×	4	=	15 × 4
	4 + 6 + R1		4 + 6 + 100/7

or IR1 =	15 × 4 × 7	= 2.47 A.
	170

and

I2 = IR1 ×	20
	20 +	50
		3

or I2 =	2.47 × 20 × 3	=1.34A (B→A)
	110

Now, I = I₁ – I₂ = 1.71 – 1.34 = 0.37 A.