They reduce pregnancy because the delay the uterus releasing the egg, and delay ovulation. Less than 1% of women who use IUDs pregnant, although pregnancies after the emergency contraceptive pill are not as rare.
The objective statement would be choice B. Since objective statements describe exactly a point being made that’s not based on opinions in this case nor feelings.
Motor oil or house paint is what needs special handling. i just usually throw away batteries. but i think the right answer is motor oil. it can effect the earth or ground water. <span />