Final answer:
C. Blood pressure 170/80 mm Hg. The priority assessment finding that the nurse should report to the provider for a client with hyperthyroidism is a blood pressure of 170/80 mm Hg.
Step-by-step explanation:
The priority assessment finding that the nurse should report to the provider for a client with hyperthyroidism is a blood pressure of 170/80 mm Hg. High blood pressure can be a serious complication of hyperthyroidism and should be addressed promptly by the healthcare provider. Restlessness (option A) is a characteristic symptom of hyperthyroidism but is not typically considered a priority assessment finding. T3 level of 215 ng/dL (option B) and decreased weight (option D) are both expected findings in hyperthyroidism and may not require immediate reporting.