1. To answer the questions shown in the figure atttached, it is important to remember that the irrational number e is aldo called "Euler's number" and you can find it in many exercises in mathematics.
2. Then, the irrational number e is:
e=2.71828
3. When you rounded, you have:
e=2.718
4. Therefore, as you can see, the the correct answer for the exercise above is the option c, which is: c. 2.718