Final answer:
In the industrial synthesis of urea, a chemist combines ammonia and carbon dioxide to produce urea and water.
Step-by-step explanation:
In the industrial synthesis of urea, a chemist combines ammonia and carbon dioxide (CO2) to produce urea and water. The chemical equation for this reaction is:
CO2(g) + 2NH3(g) → CO(NH2)2(s) + H2O(l)
It's important to note that the correct answer is b) Carbon dioxide and Ammonia. This process allows for the efficient production of urea on a large scale, which is used in the manufacturing of plastics and as a fertilizer.