Apharmaceutical company prefers experimental studies to conducting surveys or observational studies. what is most likely the reason for this preference?

a. observational studies and surveys are expensive methods compared to experimental methods.
b. observational studies and surveys usually do not provide results that are as accurate as experimental results.
c. observational studies and surveys are more time consuming than experimental methods.
d. observational studies and surveys are not as eco-friendly as experiments.
e. observational studies and surveys require more human intervention than experiments.