Final answer:
The correct sequence is: Little contraception available before the twentieth century, contraceptive methods improved in the early through mid-twentieth century, and birth control pills were introduced in the late-twentieth century.
Step-by-step explanation:
The correct historical sequence of events regarding contraception is: c. Little contraception available; Contraceptive methods improved; Birth control pills introduced.
Before the twentieth century, there was little contraception available, and women had minimal control over their reproduction. By the early through mid-twentieth century, contraceptive methods improved, with innovations like vulcanized rubber for more comfortable condoms and educational pamphlets. The late-twentieth century saw a breakthrough with the introduction of birth control pills in 1960, which had a significant impact on women's reproductive rights and their ability to engage in the workforce and higher education.