When preparing a patient for an oral glucose tolerance test (OGTT), which of the following conditions will lead to erroneous results?
选项：

A: The patient remains ambulatory for 3 days prior to the test
B: Carbohydrate intake is restricted to below 150 g/day for 3 days prior to test
C: No food, coffee, tea, or smoking is allowed 8 hours before and during the test
D: Administration of 75 g of glucose is given to an adult patient following a 10–12-hour fast