Answer: Iodine
Explanation: Goiter can be defined as the abnormal enlargement of thyroid gland, located at the base of the neck just below the Adam's apple.
Although most of the goiters are painless but it may cause cough that created difficulty in breathing and swallowing.
It is caused due to intake of inadequate amount of iodine in food that we eat. When iodine requirement is not met by the food that we eat, then thyroid will not synthesize adequate amount of thyroid hormone, that may result in the formation of goiter.
So, the correct answer is Iodine.
Dwarfism is a condition caused by hyposecretion of growth hormone and would explain her height.
When it comes to blood circulation, a good and effective blood circulation is one that provides the body with a lot of nutrients - so what we want is for example an increased blood circulation to the body, but we don't want for example a decreased blood flow to some organs - those organs would then not receive the necessary nutrition. Healthy lifestyle provides good things to the body - so the answer is D, since it's the only good thing. Decreased area in blood vessels would again diminish the nutrition to some organs and a high blood pressure is also not good - it carries a risk of some diseases.
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