Answer:
You can only make two (2) variety of salad
Explanation:
According to the question, you would like to make a salad that consist of Lettuce, Tomato , cucumber and mushrooms.
We should also note that the mushrooms only have two variety.
So if we make salad more than two variety, it means that mushroom will not be in the salad
Therefore, to make a salad that will contain all the varieties of vegetables, we will only be able to make two different types of salad.