Which Time-Based Description of a Stage of Development in Pregnancy

Which time-based description of a stage of development in pregnancy is accurate?

A) Viability-22 to 37 weeks since the last menstrual period (LMP) (assuming a fetal weight >500 g) .
B) Full Term-Pregnancy from the beginning of week 39 of gestation to the end of week 40.
C) Preterm-Pregnancy from 20 to 28 weeks.
D) Postdate-Pregnancy that extends beyond 38 weeks.