Option 1 states that both Statement I and Statement II are individually true, and Statement II is the correct explanation of Statement I. Let`s dissect each statement to better understand them.

Statement I: Too much salt content in the diet could be one of the reasons for kidney failure. This statement is true because excessive salt intake puts additional pressure on the kidneys to remove the excess salt from the body. Over time, this increased workload can lead to kidney damage and, in some cases, kidney failure.

Statement II: High salt may cause high blood pressure. This statement is also true. Consuming high amounts of salt can lead to an increase in blood pressure. This happens because sodium, the main component of salt, attracts and holds onto water, increasing the volume of blood in the body. The increased blood volume puts pressure on the blood vessels, leading to high blood pressure.

Therefore, option 1 is the correct answer as both statements are true individually and Statement II provides the correct explanation for Statement I. Excessive salt intake can cause high blood pressure, which in turn can lead to kidney failure.