Altitude above sea level is given in positive values and below sea level is given in negative values. Which situation describes a hiker in Death Valley stopping at an altitude of 0 feet? *
A. The hiker starts at -10 feet then increases altitude by 10 feet.
B. The hiker starts at - 10 feet then decreases altitude by 10 feet.
C. The hiker starts at 10 feet then increases altitude by 10 feet.
D. The hiker starts at 0 feet then decreases altitude by 10 feet.
