If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), $\bar{y},$ decreases by
Figure not to scale All dimensions are in $\mathrm{mm}$
(A) $10.75 \mathrm{~mm}$
(B) $12.25 \mathrm{~mm}$
(C) $13.75 \mathrm{~mm}$
(D) $15.25 \mathrm{~mm}$
If the section shown in the figure turns from fully-elastic to fully-plastic, the depth of neutral axis (N.A.), $\bar{y},$ decreases by
Figure not to scale All dimensions are in $\mathrm{mm}$
(A) $10.75 \mathrm{~mm}$
(B) $12.25 \mathrm{~mm}$
(C) $13.75 \mathrm{~mm}$
(D) $15.25 \mathrm{~mm}$