The answer is (C): Excision.
Explanation for each option:
(A) Resection: This involves removing all of a body part. In the case of an adenoidectomy, only the adenoids are removed, not an entire body part, so this is not the correct root operation.
(B) Fragmentation: This involves breaking solid matter in a body part into pieces. Coblation does not break the adenoids into pieces; it removes them, so this is not the correct root operation.
(C) Excision: This involves cutting out or off, without replacement, a portion of a body part. An adenoidectomy involves removing the adenoids, which fits the definition of excision. Therefore, this is the correct root operation.
(D) Destruction: This involves eradicating all or a portion of a body part by the direct use of energy, force, or a destructive agent. While coblation uses energy to remove tissue, the procedure is more accurately described as excision because it involves cutting out the adenoids.
In summary, the root operation for an adenoidectomy performed via coblation is Excision.