• Antonyms are words that consist of opposite meanings to each other. Anything opposite to the given the word has a completely different meaning. 
• If the word is benevolent, its antonym is malevolent, which means having a tendency to do evil to others. 
• Similarly, if the word is exterior, its antonym is interior, which refers to the inner part of a given thing.
  The word in the given question is 'admonish.' The verb admonish is derived from the Latin word admonere. To admonish means to strongly warn someone. Now that we know what the word means, we need to find a word that means the inverse of 'admonish.'
• Logically, this means we need to find a word that means to approve of someone's accomplishment. 
• The word praise, which means to express one's warm approval of someone, is the correct match for this opposite meaning. As a result, option 'd' is the correct answer.

Hence, option D is the correct answer.