Reaction of one molecule of $\text{HBr}$ with one molecule of $1,3$ -butadiene at $40^{\circ }\text{C}$ gives predominantly:

1. A
   $3$ -bromobutene under kinetically controlled conditions
2. B
   $1$ -bromo-$2$ -butene under thermodynamically controlled conditions
3. C
   $3$ -bromobutene under thermodynamically controlled conditions
4. D
   $1$ -bromo-$2$ -butene under kinetically controlled conditions