Explanation

(c)
As Cannizaro reaction is shown by aldehydes lacking $\alpha$-hydrogen, hence the combination $CH_{3}CHO + HCHO$ is not possible
$HCHO + HCHO\ \underset{\mathrm{\Delta}}{\overset{\ \ NaOH\ \ }{\rightarrow}}CH_{3}OH + HCOO^{-}Na^{+}$
$C_{6}H_{5}CHO + HCHO\underset{\mathrm{\Delta}}{\overset{\ \ NaOH\ \ }{\rightarrow}}C_{6}H_{5}{CH}_{2}OH + {HCOO}^{-}{Na}^{+}$
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