yes

I put 'a' and got it wrong...

maybe he was answering the question posed in the title

Correct answer: depends on the context.
If it's a public property of a class I'd say c, otherwise a.

Agree with Xemic. B and D are blatantly wrong, but A and C are interchangeable as far as I've seen them. But A is the more common, to my experience, and C is what a lot of people do for function/method naming.

In other words, your test/exam/whatever seems poorly thought out. Programmers are notorious for having poor communication skills, and that goes in my academic experience as well. Exams from the computer science department are the worst exams I've ever seen, next to Japanese class.

^I've noticed that, even after just 3 classes.

I meant I thought you were right, at least the way I understand Java's conventions for local-scope variables, which I assumed it was, given the total lack of context.

I would name it a. If it is a constant I would name it d, and use underscores instead of camel case.
So it would be
CONSTANT_VARIABLE
or:
inconstantVariable

First upper case letters are for objects only.

I would look up the naming conventions for the language your using.

The correct answer is whatever naming convention is currently in use for that project. The most important thing is consistency, especially in a project with more people than just yourself working on it.

I assume when saying "in Java" they're talking about how the standard library does it.

I wouldve said c. Though if it were camel case i wouldve done: thisFormat.

A and D
A standard
D public static
i have a java stanfards document to back it up.