Final answer:
The best position to minimize aspiration risk in a client with dysphagia is the High-Fowler's position, with patients sitting up at an angle to aid in preventing the entry of food or fluid into the airway.
Step-by-step explanation:
The nurse should place the client with dysphagia in the High-Fowler's position to minimize the risk for aspiration while eating. This position involves the patient sitting up at an angle between 60 to 90 degrees which aids in preventing food or fluid from entering the airway. In contrast, a supine position (lying flat on the back) or a prone position (lying flat on the stomach) can increase the risk of aspiration. The left lateral recumbent position (lying on the left side) is not typically used during feeding for the same reasons.