From the Following Reagents, A-E, Pick Out Those Which React $\mathrm{HBr}$

From the following reagents, A-E, pick out those which react with alkenes preferentially by syn-addition. Please select all that apply.
A: $\mathrm{HBr}$
B: $m \subset C P B A$
C: $\mathrm{OsO}_{4}, \mathrm{H}_{2} \mathrm{O}$
D: $\mathrm{H}_{2}, \mathrm{Pd}$ -on-C
E: $\mathrm{BH}_{3}$

A) A
B) B
C) C
D) D
E) E