The correct option is A 3-chloro-1-propene
The correct numbering of the parent chain is 1CH2=2CH−3CH2Cl.
Halogens are always used as substituent and is present at 3rd carbon. Also one double bond is present as functional group at first carbon. Since parent chain is of 3 carbon so word root is prop. so the correct IUPAC name is 3-chloro-1-propene.