Plants fertilized once per week with Super Plant Food Formula have been shown in testing to produce twice as much fruit as plants that are not.
Explanation:
A scientific claim out of the options is that plants fertilized once per week with Super Plant Food Formula have been shown in testing to produce twice as much fruit as plants that are not.
A scientific claim is usually drawn from the result of an experiment that follows the detailed scientific steps.
In the last statement we see that word "testing ".
This suggests that an experiment must have been conducted before the claim was made.
To test a claim, a hypothesis is usually drawn out.
From the hypothesis we can test an observation and answer questions using the data obtained in the experiment.
Before the assertion was made, experiments have been conducted.
The other options are claims that have not been tested.
