Which of the following methods cannot be...

Which of the following methods cannot be used for the preparation of an ester:

A

`RCOOH+R'OH+OH^-`

B

`RCOCI+R'OH+Pyridine`

C

`RCOOH+R'OH+H^+`

D

`(RCO)_2O+R'OH+Pyridine`

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The correct Answer is:

A

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