there is no control group. there are too many variables. there is no experimental group. it does not have a testable hypothesis.
Some researchers believe that beta-carotene, which is found in carrots, may help humans live longer lives. A few scientists designed an experiment in which one-hundred people would be asked to take a double dose of beta-carotene daily for two years and another hundred people were given a placebo, a sugar pill, for the same amount of time. After the two years, the scientists planned to collect the data and draw a conclusion. This is not a good example of a scientific study and was not done because

Options:
- there is no control group.
- there are too many variables.
- there is no experimental group.
- it does not have a testable hypothesis.

there are too many variables.