Which of the following is the most precise definition of like radicals?

• A. Radicals that have both the exact same index and the exact same radicand.
• B. Radicals that have the same index (root), even if the numbers inside the root are different.
• C. Radicals that contain the same radicand (number inside the root), regardless of the root's index.
• D. Radicals that can be evaluated to yield the exact same decimal approximation.

Answer: (A)