by checking the amount of water in the soil by checking how often the pea plant receives sunlight by checking how much space the plant will have to grow by checking the type of peas growing on the parent plants
I gave my students this multiple choice question: Some pea plants always have peas with smooth skin. Other pea plants always have peas with wrinkled skin. How can a student best predict which kind of pea will grow from a seed that is planted?

Only one answer is correct among these 4 choices:
- by checking the amount of water in the soil
- by checking how often the pea plant receives sunlight
- by checking how much space the plant will have to grow
- by checking the type of peas growing on the parent plants

Could you tell me which one is correct?

by checking the type of peas growing on the parent plants