Which of the following does Peter Singer assert about the principle of equality? (Points : 1)

People should have equal rights because they are factually equal.
People with higher abilities, it stands to reason, should have greater rights.
Different groups of humans should have equal rights if scientific investigation proves that there are no genetic differences in their abilities.
It is a prescription that we should treat people equally regardless of their differing abilities.

To determine which assertion Peter Singer makes about the principle of equality, we can examine the options provided:

1. "People should have equal rights because they are factually equal."
2. "People with higher abilities, it stands to reason, should have greater rights."
3. "Different groups of humans should have equal rights if scientific investigation proves that there are no genetic differences in their abilities."
4. "It is a prescription that we should treat people equally regardless of their differing abilities."

To find Peter Singer's assertion, we can refer to his published works or interviews. Singer argues for a form of equality based on the concept of equal consideration of interests. According to him, the principle of equality does not rely on all individuals being "factually equal" or having the same abilities. Instead, it suggests that we should treat everyone equally regardless of their differing abilities.

Therefore, the correct answer is option 4: "It is a prescription that we should treat people equally regardless of their differing abilities."