they say higher u go the colder it gets. But isnt it supposed to be the opposite because the lower u go the farther ur from the sun and the higher u go the closer ur to the sun?

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail