During an excavation in Russia Jenna find a mammoth. After analyzing the body, she finds that it still has food left in its stomach from thousands of years ago. How was the food so well preserved?

O The thick skin of the mammoth kept its insides well preserved.
O It was preserved by being frozen.
O The food it ate was likely toxic and therefore did not decay.
O The stomach of a mammoth has a highly acidic environment.