The major product obtained in the following reaction is,

Solution

$$t-BuOK$$ with heat ($$\Delta$$): The bulky tert-butyl group makes $$t-BuOK$$ a very poor nucleophile for substitution ($$S_N2$$) but a powerful base for elimination.

Hence, the major product is the alkene $$C_6H_5CH=CHC_6H_5$$. The substitution products (ethers) shown in options B, C, and D are minor and not formed in major quantities due to the high steric hindrance of the base.