In limit state of collapse against flexure, the maximum strain in tension reinforcement at failure shall not be less than

A

$$0.002$$

B

$$0.002 + \frac{f_{y}}{E_{s}}$$

C

$$0.002 + \frac{f_{y}}{0.87E_{s}}$$

D

$$0.002 + \frac{f_{y}}{1.15 E_{s}}$$