Which of the following is a type of fungi? A Mushrooms B Yeast C Molds D all of these are correct

In contour drawings crossing lines is one way to indicate this

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?

What are these signs and what do they mean ?