There is actually no way for us to tell you what the answer is for 14, as we do not know how you entered. My colleagues have jumped to the conclusion that you entered with an L-2 visa, but you provide no facts to support that conclusion. The answer to 14 is the visa that you used when you last entered the US.
Additionally, there is no such thing as a "Dependent L-2" It is just L-2, which is a dependent of an L-1. So, if the answer is L-2, it should be just "L-2"