The elevations, in miles, of three museums are marked on the number line below. Point O on the number line represents sea level. Which of the following statements is true? *
A. Museum A is at sea level and both museums B and C are above sea level.
B. Museum A is above sea level and Museum B is at sea level.
C. Both museums B and C are below sea level.
D. Museums A and B are below sea level.