Your Friend Just Told You She Is Pregnant

Your friend just told you she is pregnant.She is concerned about the amount of weight she will gain during her pregnancy and is looking for some advice so that she and her baby can be healthy.Her pre-pregnancy weight was 155 pounds and she is 5'5" tall.Based on her pre-pregnancy weight,how much weight should your friend gain during her pregnancy?

A) 11 to 20 lbs
B) 15 to 25 lbs
C) 25 to 35 lbs
D) 28 to 40 lbs