I am a high school student learning chemistry and my knowledge of organic chemistry is very limited, so pardon me if I am asking a nonsensical question.
Now my thought process was, option A takes place through Sn2 mechanism and if option B must take place it would through Sn1 mechanism. My chemistry teacher told me that if the reacting halide is tertiary, it would prefer Sn1 pathway and a primary halide prefers Sn2 pathway. The answer says option A is correct because Williamson Ether Synthesis follow Sn2 pathway all the time. Why can it not follow Sn1 pathway, under the right circumstances (a polar protic solvent), which would make both reactions feasible. Some of my friends said that an elimination reaction takes place here and Sn1 isn't possible because of the elimination reaction. But why is Sn1 not possible?