What was one of the main teachings of Siddhartha Gautama?

A. Respect for one’s elders ensures social order.

B. Strict caste rules help ensure spiritual purity.

C. Priests will help lead you to enlightenment.

D. Avoid desire because it causes suffering
--------is it D

Yes.

Yes, you are correct. One of the main teachings of Siddhartha Gautama, also known as the Buddha, was to avoid desire because it causes suffering. This teaching is encapsulated in the concept of "dukkha," which refers to the inherent dissatisfaction or suffering that is part of human existence. The Buddha taught that attachment to desires and cravings leads to suffering and that the path to liberation and enlightenment lies in overcoming these attachments. To arrive at this answer, you might have considered the different teachings associated with Siddhartha Gautama and evaluated which one aligns with the principle of avoiding suffering. Good job!