Answer: b) ethyl propanoate
Step-by-step explanation:
There are two carbon chains, one with 3 carbons and the other with 2 carbons. So we take the 2-chain to be a substituent (alkyl), named ethyl (prefix eth- means two). The longest chain of 3 carbons is an alkane with an ester attached to it. This means two things: the prefix will be pro- (for 3) and the suffix will be -oate (for the ester), leaving us with propanoate. Putting it all together, we have ethyl propanoate.