A physician on your staff asked you to help her collect information on the effects of drinking alcohol during pregnancy and the birth weight of babies. You were asked to collect the following information. Did the mothers drink alcohol during pregnancy? (yes or no) Birth weight of the baby Apgar score at one minute Apgar score at five minutes The scales of these variables would be:

a. Nominal, ordinal, interval, ratio

b. Nominal, ratio, ordinal, ordinal

c. Ordinal, nominal, ratio, interval

d. Ratio, ordinal, interval, nominal