A.I. Explanation:

Option 1: "3 percent of the water."

Explanation: This option states that 3 percent of the water is hard water, which is incorrect. The text specifies that 3 percent is the total amount of fresh water available on Earth, not the amount that is hard water. Therefore, this option does not accurately reflect the information provided in the text.

Option 2: "Two third of the water."

Explanation: This option suggests that two thirds of all water on Earth is hard water, which is misleading. The text clarifies that two thirds refers specifically to the fresh water, which is only 3 percent of the total water. Thus, this option misrepresents the context and is incorrect.

Option 3: "Two third out of 3% of the water."

Explanation: This option accurately reflects the information in the text. It states that two thirds of the 3 percent of fresh water is in the form of hard water, which aligns with the text's assertion that slightly over two thirds of the fresh water is in glaciers and polar ice caps. This option correctly identifies the relationship between the total fresh water and the portion that is hard water.

Option 4: "97 percent of the water."

Explanation: This option incorrectly claims that 97 percent of the water is hard water. The text indicates that 97 percent of the water on Earth is salt water, not hard water. Therefore, this option contradicts the information provided in the text and is incorrect.