Final answer:
The College of Dental Hygienists of Ontario (CDHO) allows dental hygienists to self-initiate scaling and root planing.
Step-by-step explanation:
The College of Dental Hygienists of Ontario (CDHO) authorizes dental hygienists to self-initiate certain procedures without the need for a specific order from a dentist. Among the authorized acts, the appropriate answer is C) Scaling and root planing. Dental hygienists with the appropriate training and registration can independently perform scaling and root planing, which are routine parts of dental cleaning and maintenance, essential for the management of periodontal disease. It's worth noting, however, that functions such as the diagnosis of dental conditions, administration of anesthesia, and prescription of medication remain within the scope of practice for dentists and are not self-initiated by dental hygienists in Ontario.