b
really i m sconfused btwn a n b
here you have to think in terms of stability of Nucleophiles
the more stable it is, the less reactive it is
a nucleophilic character can be checked by finding the conjugate acid of the nucleophile.The nucleophile will have higher nucleophilic character if its conjugate acid is weak
ya sir phenoxide ion wud b more satble na cuz it has more resonating structures so answer shud b b na
acetic acid
bcuz only 2 resonating structures so more tranfer n quick tranfer of H+