B. the person may choke
C. the person will experience a heart attack
D. the person will get swollen lymph nodes
withdrawal
B.
abstinence
C.
diaphragm
D.
IUD
The correct answer here would be B.
The withdrawal method does not always work and accidents can happen. A diaphragm can move or come out and it's percentage of effectiveness is not 100% guaranteed, it is more around 92 - 96%. An IUD is 99% effective as a contraception and is one of the most reliable forms. However to be 100% sure you will not get pregnant is to practice abstinence which means not having sexual intercourse at all.