be /feel obliged to do sth. A. to feel that it is necessary to do sth. B. having just come back from

be /feel obliged to do sth. A. to feel that it is necessary to do sth. B. having just come back from a particular place or experience C. to be reasonable or logical or comprehensible

The correct answer is A.

Definition: To be/feel obliged to do something means to feel that you must do something because it is necessary, a duty, or for moral/legal reasons.

Examples:

"I felt obliged to help him after all he had done for me."

"Employers are legally obliged to pay the minimum wage."