The following table cross-classifies pregnant women in the study by their body mass index (BMI) at 16 weeks gestation and whether they had pre-term delivery. What is the probability of women with BMI less than 30 and delivers pre-term?

BMI < 30 BMI 30-34.9 BMI 35+

Pre-term 480 70 130

Full term 4800 460 280

A)0.086

B)0.077

C)0.0493

D)0.539

Please provide answer and explanation