Consider the following reaction (i) dil. NaOH

Propanal + Methanal= (ii)Δ Product B C₅H₂O₃
(iii) NaCN
(iv) H₃O⁺
The correct statement for product B is. It is

a. Optically active and adds one mole of bromine
b. Racemic mixture and is neutral
c. Racemic mixture and chres a gas with saturated NaHCO₃ solution
d. Optically active alcohol and is neutrall