The isoline representation is the most used method to visualise quantitative phenomena which occur comprehensively and which values vary continuously in space. They are therefore called continua. Examples for such continua are temperature, air pressure, precipitation heights or ground elevations.
“Geography Cat believes that both are very damaging, but that the primary impacts of a tropical storm are more damaging than the secondary impacts. For example, the most devastating primary impact of Typhoon Haiyan, which hit the Philippines in 2013, was the death of 6 300 people.”
I believe it is D. International date line, because the question holds the answer. When you say "Different days" it kind of gives the answer away.
Hope this helps :)
Spain was not a German occupied territory