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