The error in the experiment is that different types of seeds could be used. Option D
What is an error?
We know that an experiment can be used to establish the relationship between the dependent and the independent variables. Now note that an experiment can be able to establish a cause and effect relationship.
Now In this case, we are trying to find out the factors that account for the size of the pumpkin. We have to note that we have to look at different types of seed in order to establish the validity of the experiment.
Hence, the error in the experiment is that different types of seeds could be used. Option D
Learn more about experiment:https://brainly.com/question/11256472
#SPJ1