This reaction involves the addition of HBr to an alkene, following Markovnikov's rule. The hydrogen adds to the less substituted carbon, and the bromine adds to the more substituted carbon. The carbocation intermediate is stabilized by the phenyl ring, leading to the major product.

The major product is the bromoalkane where Br is attached to the tertiary carbon, as shown in the third option.

Final Answer: aromatic ring will be major.