Can someone clarify what the answer should be and what was the answer on the show?
There is a running joke that some people falsely consider HTML a programming language which it is not. So it’s D. I didn’t watch the show but I assume that’s it and the joke is that the audience’s majority took alien language

Interestingly C and D are both programming languages. That is, there is a programming languages called C and another, D.

I’ll see myself out…

Trying to remember from automata theory, does the empty set accept an empty grammar?

Like how in some languages an empty source file is valid? So then “none” is a programming language with an empty language grammar?

Yes, C is alien language pretty often. The other half it is wizardry.

A and B are also programming languages. A is an APL implementation and B is a precursor of C.

aplwiki.com/wiki/A en.m.wikipedia.org/wiki/B_(programming_language)

A - APL Wiki