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 1.88 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