Final answer:
The appropriate placement of a tongue blade for assessment of the mouth and throat is on the dorsum of the tongue.
Step-by-step explanation:
The appropriate placement of a tongue blade for assessment of the mouth and throat is placed on the dorsum of the tongue (option b).
When assessing the mouth and throat, the tongue blade or depressor is placed on the dorsum of the tongue, which is the upper surface of the tongue. This placement allows for better visualization of the oral cavity and pharynx.
By placing the tongue blade on the dorsum of the tongue, healthcare professionals can examine the structures, such as the uvula, palatine tonsils, and other areas, to assess for any abnormalities or signs of infection.