Step 1: Longer duration and deep-rooted crops need more total seasonal water.
Step 2: Sugarcane (long duration) needs the most water, followed by ponded rice which needs less.
Step 3: Wheat needs a moderate amount, and shallow-rooted spinach needs the least.
Step 4: Correct match, (A)-(I), (B)-(II), (C)-(III), (D)-(IV).