I WOULD LIKE TO KNOW THE REASON _______ HE DECIDED TO QUIT THE JOB....

16. - KT TAP TRUNG 12 DE DAP AN TIENG ANH
Tiếng Anh KT TAP TRUNG 12 DE DAP AN TIENG ANH
16.I would like to know the reason _______ he decided to quit the job.a. why b. which c. that d. when