I think B is answer because Boiling point is a physical property.
The correct answer would be through adaptation and eventually over time they had to evolve to the area around them which made them develop over time to have longer necks .
In humans sperms can survive 3 -5 days within the female reproductive tract.
The ideal time of fertilization is around ovulation when the egg is in the fallopian tube. After travelling through the vaginal canal, the strongest sperm make it to the cervix. From here, the sperm must travel through the uterus and into one of the fallopian tubes.