What is the structural formula of the main product formed when hydrogen bromide reacts with $2$-methylbut-$2$-ene?
- A$\text{CH}_2\text{BrCH(CH}_3)\text{CH}_2\text{CH}_3$
- B$(\text{CH}_3)_2\text{CBrCH}_2\text{CH}_3$
- C$(\text{CH}_3)_2\text{CHCHBrCH}_3$
- D$(\text{CH}_3)_2\text{CHCH}_2\text{CH}_2\text{Br}$