"is not possible to tell from only the Web address." is incorrect. Most of the times, you can be pretty sure that .gov is for governmental institutions, .edu is for educational ones, .com.br is for Brazilian websites and so on.
"Because it is not an “https” site, it should not be used." is also wrong. That only means that without the s in the end, there's no encryption, but it is not enough reason not to use a website. Not by itself.
"Because it misspells “volcano,” it shouldn’t be used." this just makes no sense at all. If it's a stylized brand with a differently spelled name?
The correct answer is:
The “.gov” in the address tells me it is a government site.