The maternal mortality ratio is: a. The number of pregnant women who die per 100,000 in a given year b. The number of women who die as a result of pregnancy and childbirth complications per 100,000 women in a given year c. The number of pregnant women who die per 10,000 live births in a given year d. The number of women who die as a result of pregnancy and childbirth complications per 100,000 live births in a given year