The answer is B. Natural numbers are {1,2,3,4...} so basically positive. Intergers consist of 0 so it can range from -#s to +#s
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Answer:

Step-by-step explanation:
Let assume that Earth is a sphere, the following trigonometric diagram is constructed and presented below. The central angle is given by this inverse trigonometric equation:



The distance of the portion of Earth that can be seen is:


The sum of 3/4 7/12 is 4/3