Final answer:
After menopause, the decreasing levels of estrogen can lead to a decline in cognitive abilities.
Step-by-step explanation:
After menopause, the decreasing levels of estrogen can lead to several changes in the body. One of the effects is a decline in bone density, which increases the risk of osteoporosis and fractures. Therefore, option A, increased bone density, is incorrect. Additionally, the decrease in estrogen can lead to an increased risk of heart disease, as estrogen helps reduce cholesterol levels in blood vessels. So, option B, reduced risk of heart disease, is also incorrect. Another effect of decreasing estrogen is a decline in cognitive abilities, such as memory and concentration. Therefore, the correct answer is option C, decline in cognitive abilities. Lastly, decreasing estrogen can also lead to a decrease in skin elasticity, resulting in drier and less elastic skin. So, option D, improved skin elasticity, is incorrect.