The vitamin that poses the greatest risk for toxicity isMultiple Choicevitamin D.vitamin K.vitamin E.vitamin A.

The vitamin that poses the greatest risk for toxicity is vitamin A.

Vitamin A is a fat-soluble vitamin that is stored in the body. This means that unlike water-soluble vitamins, excess vitamin A is not excreted in the urine but rather builds up in the body. Over time, this can lead to vitamin A toxicity, also known as hypervitaminosis A.

Symptoms of vitamin A toxicity can include dizziness, nausea, headaches, skin irritation, joint and bone pain, and in severe cases, even hair loss or damage to the liver and brain.

Therefore, while all vitamins are essential for health, it is important to ensure that you are not consuming too much vitamin A. This is particularly important for those who take supplements, as these can often contain high levels of vitamin A.

It's always best to consult with a healthcare provider or a nutritionist to ensure that you are getting the right amount of vitamins and nutrients in your diet.