Identify the product (A) obtained in the following reaction

The correct answer is option 3.

The mechanism for the reaction involves a single step which is as follows:

4-Methyl benzenediazonium chloride is not a very stable compound, so when it is treated with an alcohol the hydrogen atom present on the carbon adjacent to alcohol group attacks and formation of stable arene takes place along with the formation of respective aldehyde. The reaction mechanism for reaction of ethanol with 4-Methyl benzenediazonium chloride is shown as follows: