সঠিক উত্তরঃA.
He said that he had been working since sunrise
Explanation: Reporting verb–টি past tense-এ থাকলে Indirect Narration –এ direct speech এর verb Corresponding past tense -এ পরিবর্তিত হবে। অর্থাৎ present perfect হলে Past Perfect Continuous হবে।
