Detailed Explanation:

Turmeric powder is obtained from the dried rhizome (underground stem) of the turmeric plant, not from root, foot, or seed.

A rhizome is botanically a modified stem that grows horizontally underground; it is distinct from true roots which absorb water and nutrients.

Options 1 ("Dried foot" - not a plant part), 2 ("Dried root" - incorrect organ), and 3 ("Seed" - turmeric rarely produces viable seeds) are all incorrect, making Option 4 ("None of the above") the correct answer.