An isobar is a line on a weather map that connects lines of equal
a)pressure
b)height
c)temperature
d)moisture

An isobar is a line on a map on which all of its points are at the same pressure. 
It doesn't connect lines of anything.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

The correct answer is:   [b]:   "has no atmosphere" .