Final answer:
Mild to moderate alcohol consumption is beneficial to the cardiovascular system, and it is defined as up to one drink per day for women and up to two drinks per day for men.
Step-by-step explanation:
The question is asking about the beneficial effects of mild to moderate alcohol consumption on a specific body system, and the number of drinks per day that is considered to be within this range. According to the provided information, moderate alcohol consumption is defined as up to one drink per day for women and up to two drinks per day for men. Therefore, the correct answer is a. Two; cardiovascular system.