Answer:
C - Slang
Explanation:
Gibberish is typically only used by young children. Not appropriate here since you're likely not talking about a 3-5 year old.
Formal language is typically only used in a professional setting or with people you're not familiar with (i.e. not your family or friends)
Jargon is like slang, but it's used in a professional setting. Doctors use jargon when talking about diseases. Ex: A "JT" is a joint. This isn't slang you'd use unless you were in their workplace.
It's slang because we use slang when talking to someone we're familiar with and in a non-formal situation. Borrowing a bike from our brother is non-formal, and we're familiar with him.
Is this a question if so you could find it online
Answer:
There are real differences in the populations in different countries. Demographics are particularly important - that's things like average age, or where people live.
Explanation:
But not all testing data is the same - some countries record the number of people tested, while others record the total number of tests carried out (many people need to be tested more than once to get an accurate result).
