Step 1: The edible part of garlic is the bulb, made of a short compressed stem called the basal plate bearing modified leaf bases called cloves. It is a modified stem structure, not a modified root, so Statement (I) is incorrect.
Step 2: Cutting or crushing garlic tissue activates the enzyme alliinase, which breaks down alliin into allicin and other sulfur compounds that evaporate and give garlic its sharp smell, so Statement (II) is correct.
Step 3: Statement (I) is incorrect but Statement (II) is correct, so the answer is option 4.