Answer:
You would use 'is'
Measles 'is' a disease most children experience
Measles 'are' a disease most children experience
The 'is' Sounds better in the sentence
If you want more information about your city's population, you would most likely use (C) information from the city's official website published in that calendar year.
This source is not only official but is also in the latest time period so that the information listed here will most likely be correct.
The foot-in-the-door method is basically a psychological method where you ask for a small request first, then a bigger one later. So I think it's A, just because the others don't work. B is just straight up asking for a big favor, C is providing you with the "must-do" effect, and D is simply a favor for a favor.
A that’s the answer hope this helps
True, lots of these groups use language because it helps us communicate with a person in many ways.