The wife fainted away, lamenting the death of her husband.

Answer: Option D

Lamenting : express passionate grief about.
Smiling : the action or fact of smiling.
Ridiculing : subject to contemptuous and dismissive language or behaviour.
Enjoying : take delight or pleasure in (an activity or occasion).
Rejoicing : great joy; jubilation.

Antonym of Lamenting is Rejoicing