Answer:
B. they are unsaturated
Explanation:
Alkanes are long chain hydrocarbons with only single bonds, alkenes are hydrocarbons with at least one double bond and alkynes are hydrocarbons with at least one triple bond.
Alkanes, alkenes and alkynes are all hydrocarbons. Therefore statement D. is incorrect
Hydrocarbons are compounds containing carbon and hydrogen only
Neither of the three are aromatic compounds therefore statement A is incorrect
Saturated hydrocarbons are where all the bonds between atoms are single bonds. Unsaturated hydrocarbonds are when at least there's one double or triple bond.
Alkanes are saturated and Alkynes and alkenes are unsaturated.
therefore statement B is correct where alkenes and alkynes are unsaturated but alkanes are not
