For an LTI system with impulse response h(t), what does the output become when the input is a unit step function?

Correct option is B

​$$\text{For a Linear Time-Invariant (LTI) system, the output } y(t) \text{ is given by the convolution of the input } x(t) \text{ with the impulse response } h(t): \\[6pt]y(t) = x(t) * h(t) \\[8pt]\text{When the input is a unit step function } u(t): \\[6pt]y(t) = h(t) * u(t) \\[8pt]\text{This result is known as the step response of the system.}$$​​