For legal purposes - it must be lat, long and date. So, none of those answers are correct, but C is the least wrong and would be correct if the question was about endurance of daylight.
In reality, the actual availability of light is heavily dependent upon cloud cover and terrain.
I had a good example last month at EGTC - I was a late departure to EGTE, flying off 21. Taxiway A at EGTC has bu66er all lighting, so I had to ask for a follow-me vehicle from parking near the tower to the threshold and could only then see where I was going once I was right next to the runway lights (and yes, my landing/taxi light was serviceable!).
According to my GPS, whose algorithms I'm sure are correct, legal night started 1 minute after I took off! Fact is, that close to dusk and with an overcast, "real" night started about five minutes after dusk.
So, learn the right answer for the exam, but apply lots of commonsense in real flying.
G