A singly-reinforced rectangular concrete beam of width $300 \mathrm{~mm}$ and effective depth 400 $\mathrm{mm}$ is to be designed using M25 grade concrete and Fe500 grade reinforcing steel. For the beam to be under-reinforced, the maximum number of $16 \mathrm{~mm}$ diameter reinforcing bars that can be provided is

(A) 3

(B) 4

(C) 5

(D) 6

A singly-reinforced rectangular concrete beam of width $300 \mathrm{~mm}$ and effective depth 400 $\mathrm{mm}$ is to be designed using M25 grade concrete and Fe500 grade reinforcing steel. For the beam to be under-reinforced, the maximum number of $16 \mathrm{~mm}$ diameter reinforcing bars that can be provided is

(A) 3

(B) 4

(C) 5

(D) 6

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