$'A'$ and $'B'$ formed in the following set of reactions are :

The reaction that gives the following molecule as the major product is:

$(CH_3)_3C-CH(O)CH_2 + CH_3SNa \xrightarrow{C_2H_5OH} ?$
The product formed is:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R).$
Assertion $(A):$ Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.
Reason $(R):$ Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether.
In the light of the above statements,choose the most appropriate answer from the options given below:

Amongst the following compounds,the compound having the lowest boiling point is

Which of the following methods is used to prepare ethoxyethane by Williamson synthesis?