Consider the following reaction
`CH_(3)-underset(D)underset(CH)-underset(CH_(3))underset(|)(CH)-CH_(3)+Br^(+)rarrX+HBr`
Identify the structure of the (X)

Options

A. `H_(3)C-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)(CH_(3))-overset(.)(C )H_(2)`
B. `H_(3)C-underset(D)underset(|)(CH)-underset(CH_(3))underset(|)overset(.)(C)-CH_(3)`
C. `H_(3)C-underset(D)underset(|)overset(.)(C)-underset(CH_(3))underset(|)(CH)-CH_(3)`
D. `H_(3)C-overset(.)(CH)-underset(CH_(3))underset(|)(C)-CH_(3)`

Answer

B

Explanation

`Br` is less reactive and more selective. Thus the formation of `3^(@)` radical will be the major product.