The correct answer is E. decide whether the drug was safe enough for use on humans.
A computer can be programmed to perform many tasks, including keeping records, calculating data, and making decisions. However, a computer cannot make a judgment call about whether a drug is safe for humans. This is because a computer does not have the same level of understanding of human physiology and pharmacology as a human does. Additionally, a computer cannot take into account the ethical and social implications of using a new drug on humans.
The other options are all tasks that a computer could easily perform. For example, a computer could be programmed to keep track of the total amount of drug that had been given to all 1000 rats, the dosages and the dates the drug was given to each rat, and the weight changes of the 1000 rats.
It is important to note that computers are becoming increasingly sophisticated, and it is possible that in the future, computers may be able to make judgments about the safety of drugs for humans. However, at this point in time, it is still necessary for humans to make these decisions.