ব্যাখ্যা
The correct answer is option (d) "approval."
'Approve' (verb) → 'Approval' (noun). The suffix '-al' is added to form the noun.
Example: 'The project received approval from the board.'
Other verb → noun with '-al': arrive → arrival, refuse → refusal, dismiss → dismissal, propose → proposal.
✗ 'Approof', 'approveness', 'approvally' are all incorrect forms.
Source: English Vocabulary in Use — Cambridge.