You Are Going Camping with a Friend in June in the Lovelock

You are going camping with a friend in June in the Lovelock, Nevada area. Your friend, who is wearing a t- shirt, says "my pack is pretty full. Do I really need this jacket?" What would be a fair response?

A) "While it is warm during the day in this climate there are great daily contrasts. Bring the jacket."
B) "This is a midlatitude desert in summer so should be warm enough without a jacket."
C) "Dry air feels warm even at very low temperatures. Do not pack the jacket."
D) "We are in midlatitudes and even in the desert it is essentially always cold, so bring your jacket."