The correct answer is choice C. 30 minutes. According to the CDC, the American Diabetes Association, and other sources, exercise can help lower blood sugar levels and improve insulin sensitivity for women with gestational diabetes.

It is recommended that they get at least 30 minutes of moderate-intensity physical activity at least five days a week, unless advised otherwise by a healthcare provider.

Choice A is wrong because 10 minutes of exercise per day is too low to have a significant effect on blood sugar levels and insulin sensitivity.

Choice B is wrong because 20 minutes of exercise per day is also below the recommended amount for women with gestational diabetes.

Choice D is wrong because 60 minutes of exercise per day may be too much for some women with gestational diabetes, especially if they have other complications or risk factors.

They should consult their healthcare provider before engaging in such a high level of physical activity.

Normal ranges for blood sugar levels during pregnancy are:

• Fasting: less than 95 mg/dL

• One hour after a meal: less than 140 mg/dL

• Two hours after a meal: less than 120 mg/dL