The correct option is A <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
He will have been picking apples for 30 years this November.
A sentence in the future perfect continuous tense must have the modal verb ‘will’, followed by the helping verbs ‘have’ and ‘been’, and finally the present participle form of the main verb. This means, ‘He will have been picking apples for 30 years this November’ is the correct option.