PIMSO 2021 - Science - Grade 6 - National Round Mock Test Question 1

Gloria planted corn on a plot of land. She noticed that the plants were not growing well. Her friend, Korina, commented that the presence of weeds has affected the growth of the corn plants. Which of the following explains why the corn plant is not growing well?
I. There is not enough air for the corn plants.
II. There is not enough food for the corn plants.
III. There is not enough space for the corn plants.