Question

In the practice of religion, the Ten Commandments
are to Christianity as the Eightfold Path is to
(1) Buddhism (3) Islam
(2) Daoism (4) Shinto

Answer 1

Ten Commandments are the basic and most important law of Christianity; the  most important rules and principles by which people have to live.

This is equivalent to the Eighfold Path in Buddhism (answer 1) is the correct one): they are the major principles by which the Buddhists have to live.