$$\mathrm{CH_3-CH=CH-CH=CH-C_2H_5}$$ is

The compound is a conjugated diene. Count the carbon atoms in the main chain: $7$ carbons, so the parent hydrocarbon is hepta-diene. Number the chain to give the double bonds the lowest locants. From the left, the double bonds are at $2$ and $4$. From the right, they would be at $3$ and $5$. So the correct numbering is $$\mathrm{hepta-2,4-diene}.$$ Therefore the locant asked for is $2,4$, which corresponds to option $\mathrm{A}$ if interpreted as the first locant count pair, and among the given single numbers the number of the terminal carbon from the nearer side giving first double bond position is $2$. Re-checking the options $4,3,2,5$, the matching value is $2$.