36. When a Grignard reagent is allowed to react with an ester, followed by acidifying the reaction mixture, a tertiary

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36.
When a Grignard reagent is allowed to react with an
ester, followed by acidifying the reaction mixture, a
tertiary alcohol is formed. During the mechanism of
this reaction, the following steps occur:
Step A: The Grignard reagent attacks the
ester.
Step B: The oxygen atom is protonated.
Step C: The leaving group leaves.
Step D: The Grignard reagent attacks the
ketone.
What is the order in which they actually occur? (A,B,C,D?)