Reaction of ethyl formate with excess with excess of `CH_(3)Mgl` followed by hydrolysis gives

The reaction of ethyl formate with excess of CH_(3)MgI followed by hydrolysis gives

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Ethyl acetate on treatment with excess of CH_3MgBr followed by hydrolysis gives 2-methylbutan-2-ol. R: CH_3MgBr acts as a base in this reaction.

Ethyl acetate reacts with excess of CH_(3)MgBr to form :

Which of the following compounds will provide a tertiary alcohol on reaction with excess of CH_(3)MgBr followed by hydrolysis?