Pick and copy all the incorrect options for the following question:

Robert is a fisherman who wants to find a way to catch more fish. He decided to try different sizes of hooks. Robert caught 4 catfish, 3 trout, and 7 perch while using worms for bait. Which is the independent (manipulated) variable in Robert's investigation?

Options:
- type of bait
- size of hook
- type of fish caught
- number of fish caught



- type of bait





- type of fish caught



- number of fish caught

