How much water is needed for cooking 1 kg of pasta?

In cooking pasta, a common guideline is to use about 1 liter of water for every 100 grams of pasta. Therefore, for 1 kilogram (or 1000 grams) of pasta, you would typically need around 10 liters of water. However, it's also common to use a lesser amount if you're cooking pasta in a pot with a larger surface area or if you're using a different cooking method, which could lead to a lesser requirement.

In the context of the choices provided, 4 liters is a reasonable quantity for cooking 1 kg of pasta, as it allows sufficient water to ensure that the pasta can move freely while cooking, which is crucial for even cooking and preventing the pasta from becoming sticky. While 2 liters may be a bit low, considering the starch that is released into the water during cooking, 4 liters strikes a balance that accommodates these factors without excessive wastage.

Choosing 4 liters acknowledges the flexibility in cooking methods and ensures that the pasta can be cooked effectively while still being practical in terms of water consumption for most typical cooking scenarios.