Let u(t) be the unit step function. Which of the wave forms

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Let u(t) be the unit step function. Which of the wave forms in fig. corresponds to the convolution of u(t) – u(t – 1) with u(t) – u(t – 2)?

Correct Option: B

Given x₁(t) = u(t) – u(t – 1)
x₂(t) = u(t) – u(t – 2)

x(t) = x₁(t) * x₂(t)

or x(t) =		^∞	x₁(τ) x₂(t – τ )dτ
		_{– ∞}

Hence, alternative (B) is the correct choice.