Which sentence is a good opening topic sentence for the following text?
Vitamin D helps the body absorb calcium and phosphorous. It assists the body by increasing the amount of calcium absorbed from the small intestine. This in turn forms and maintains bones. Vitamin D plays a crucial role in immunity and controlling cell growth. It protects the body like a soldier and helps the body fight infections. It is important that children get adequate amounts of vitamin D to develop healthy teeth and bones. The main source of vitamin D is milk. Vitamin D is also found in herring, salmon, and sardines. Cod liver oil is another source of vitamin D. Our skin also produces vitamin D from sunlight. However, for the skin to absorb vitamin D from sunlight, it needs to be exposed to sunlight. About 15 minutes of exposure twice a week is enough for the skin to produce vitamin D. The skin can be exposed to the sun while taking a walk or playing outside.
A...Vitamin D is essential during the early growth and development in children.
B...A balanced diet along with regular exercise helps to increase your lifespan.
C...Vitamin D is a vital nutrient required for maintaining a strong and healthy body.
D...A few minutes of exposure to the early sun helps to improve your overall health.
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