The correct option is D paid no attention to
To "disregard" something is to pay no attention to it or ignore it. Hence, option C "pay no attention to" is the correct answer.
"Did not ignore" is incorrect as she was angry. Why would she be angry if he did not ignore her feelings. This is an antonym of the given word.
"Discharged" means released from hospital or from restraint of law.
"Considered" is an antonym.
Thus, option C is correct.