which of the following is correct about the Constitutional Convention and slavery?

Although some delegates opposed slavery on principled grounds, the Convention allowed it to continue where it existed so that the southern states would join the Union.

The authors of the Constitution seriously considered allowing slavery everywhere in the country, but decided not to do so after strenuous objections from some northern delegates.

The authors of the Constitution made it clear that they did not understand slaves to be people equal to the rest.

The authors of the Constitution showed no concern about the institution, and so permitted it to exist