Judging by how it's used in the context, I would say C. A great number.
Key words are prepositions
The answer is an altimeter it measures altitude and altitudes definition is height
The appropriate response is this real world. On the off chance that you discuss this real world, you are alluding to the world and life all in all, rather than a specific individual's own particular life, experience, and thoughts, which may appear to be untypical and doubtful.
