Mary finds that she regularly retains water at a certain point in the menstrual cycle. What is chemically similar to aldosterone

Your question seems to me imprecise or poorly written, but compared to what is written I can clarify the following:

In our body we have a blood pressure regulating system through blood volume (which retains less or more fluid to increase or decrease blood volume and consequently blood pressure). This system is called renin-angiotensin-aldosterone what which participates the kidney, lung and capillaries with its own barometric receptors, is an incredible system within the body, which by increasing aldosterone promotes a retention of fluid at the level of the renal glomerulus (kidney) to maintain the blood pressure of the vessels and thus increase it.

Explanation:

It may happen to Mary that this system is activated in a menstrual situation since it may be that she loses too much liquid or blood volume through her menstruation and the body seeks to reward it along with other iron mechanisms for the transitory anemias that menstruation generates (that is this reason that it is not recommended to do blood tests in menstrual stages)

the answer to your question is c