The correct answer is: B. Molten zinc.
Brass is an alloy of copper and zinc. The proportions of copper and zinc can vary, but the most common type of brass is 70% copper and 30% zinc. Brass is a hard, durable metal that is resistant to corrosion. It is used in a variety of applications, including plumbing fixtures, musical instruments, and jewelry.
When copper and zinc are melted together, they form a solution. The copper atoms are dissolved in the zinc atoms, and the resulting alloy is called brass. The properties of brass depend on the proportions of copper and zinc in the alloy. For example, brass with a higher proportion of copper will be harder and more durable than brass with a lower proportion of copper.
The other options are incorrect because they do not describe the correct composition of brass. Solid zinc, gaseous zinc, and molten tin are not components of brass.