47. When an ¹⁸O-labelled ester is treated with NaOH in H₂O, carboxylic acid and alcohol are isolated. Which of the following statements is true?
(¹⁸O-ester + OH⁻/H₂O → R-COOH + R’-OH)

(A) ¹⁸O remains in both oxygen atoms of the carboxylic acid.

(B) The solvent water should contain ¹⁸O.

(C) ¹⁸O remains in the carbonyl oxygen only.

(D) ¹⁸O remains in alcohol only.

(E) ¹⁸O is found in both the carboxylic acid and the alcohol.