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ANSWER
C. 2.5A
Begin by finding the total resistance of this circuit. Because this is a parallel circuit, total resistance is measured with the formula: 1/R = 1/R1 + 1/R2 e.t.c.
1/R = 1/8 + 1/8 + 1/4 = 1/2
Thus, R=2Ω
To find the current of I3, use the formula: I = V/R
I = 10/4Ω = 2.5A
If one wanted to confirm their answer, they could find the currents of the other resistors and add up them. They should add up to the total current (I = V/R = 10/2Ω = 5A).