Option 1 matches a track measured at the origin with variation applied correctly. (Track measurement on a Lamberts Conformal should be done at the mid point, not origin)
Option 2 matches a mid point measurement but fails to apply variation at all (response doesn't answer the question by failing to apply one of the parameters)
Option 3 matches a mid point measurement and applies variation correctly (correct method)
Option 4 matches a mid point measurement and applies variation incorrectly (another common error in technique)
And that also neatly ties in with another thing about multiple choice questions. If you have to guess, guess C.
For some weird reason humans can't distribute the correct answers randomly. So unless a deliberate randomization (shuffle) was applied after the questions and answers were written, the correct answer in well over 25% of the questions is C.
Ask a hundred people to name a random number between 1 and 20 (inclusive). Well over 5% will say 18, while the numbers 1, 10 and 20 will probably not be called at all. Because they're considered too obvious or something like that.