For the reaction $H_{2(g)} + Br_{2(g)} \rightarrow 2HBr_{(g)}$,the experimental data suggests the rate law is $\text{Rate} = K[H_2][Br_2]^{1/2}$. Find the order of the reaction and its molecularity.

• A
  Order $2$ and molecularity $2$ respectively
• B
  Order $1\frac{1}{2}$ and molecularity $2$ respectively
• C
  Order $2$ and molecularity $1\frac{1}{2}$ respectively
• D
  Order $1\frac{1}{2}$ and molecularity $1\frac{1}{2}$ respectively