Question

a principal who leads a prayer at a graduation violates the first amendment’s
establishment clause.
freedom of religion clause.
free - exercise clause.
lemon test clause.

Explanation:

The First Amendment's Establishment Clause prohibits the government (and public school officials like a principal, as schools are government - funded) from establishing or promoting a religion. Leading a prayer at a graduation, a public school event, is seen as the school (a government entity) promoting religious activity, which violates the Establishment Clause. The "freedom of religion clause" is a general term, and the Free - Exercise Clause is about the right to practice one's religion, not about the government's promotion of religion. There is no "lemon test clause" as such; the Lemon Test is a legal test used to determine violations of the Establishment Clause.

Answer:

A. establishment clause.