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Please read the following scenario to answer the following questions.
Osteoporosis is a disease characterized by loss of bone mass and an increased susceptibility to bone fractures. It threatens more than half of all Americans over the age of 50. Women are about four times more likely to suffer from the disease than men. Osteoporosis may progress undetected until bones become so weak that they break during common activities. Prevention of osteoporosis includes regular weight-bearing exercise, recommended intake of calcium and vitamin D, and avoidance of smoking and excessive alcohol.
Astronauts returning from long periods in space often have very fragile bones. This is likely related to ________.
A) overproduction of thyroid hormone
B) lack of gravity
C) diet lacking in calcium
D) excessive production of ADH

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