The correct option is A Aldehydes, which further undergo reduction to give alcohols.
Hydroformylation of olefins:
It yields aldehydes, which further undergo reduction to give alcohols.
RCH=CH2+H2+COCatalyst−−−−−→RCH2CH2CHO
RCH2CH2CHO+H2Catalyst−−−−−→RCH2CH2CH2OH