An Unknown Organic Compound Contains Carbon,hydrogen,and Bromine Only

An unknown organic compound contains carbon,hydrogen,and bromine only.The mass percentages of C and H are 12.77% C and 1.60% H.Bromine from 1.87 g of this compound has been completely converted into 3.70 g of AgBr.The molar mass of unknown organic compound is 188 u.Determine the molecular formula of the unknown.

A) CH₃Br
B) C₂H₃Br₂
C) C₂H₂Br₂
D) C₂H₂Br₄
E) C₄H₆Br₄