Researchers must first test experimental drugs on nonhuman subjects because of: Select one: 8. monetary considerations. b. the availability of animals. c. ethical considerations. d. time allotments.

## Step 1<br />The question is asking why researchers must first test experimental drugs on nonhuman subjects. The options provided are monetary considerations, the availability of animals, ethical considerations, and time allotments.<br /><br />## Step 2<br />The primary reason for testing experimental drugs on nonhuman subjects is due to ethical considerations. This is because it is not ethically acceptable to test potentially harmful substances on humans before they have been proven safe and effective in other subjects.<br /><br />## Step 3<br />Monetary considerations, the availability of animals, and time allotments are not the primary reasons for testing experimental drugs on nonhuman subjects. While these factors may influence the process of drug testing, they are not the main reason why researchers must first test experimental drugs on nonhuman subjects.