PLEASE HELP ME FAST A student conducted an experiment to test whether talking to plants would help them to grow faster. He set up the following two groups:

Group 1: spoken to and hand watered
Group 2: not spoken to and watered with sprinklers

After three weeks, the plants in Group 1 showed much more growth than those in Group 2. Based on the results of this expe ment, which is the best conclusion?

O They are valid because the student ran a controlled experiment.
O They are not valid because the student did not control all the variables that can affect plant growth.
O They are valid because the dependent variable caused a change in the independent variable.
O They are not valid because the time frame to grow a plant is too short.