What Was the Result of the Convention of 1818

What was the result of the Convention of 1818?

A) Britain gave up its claim on the Oregon Country because the soil there was too rocky.
B) Russia ceded California to the Americans because Tyler offered a great sum of money.
C) Britain and the United States agreed to establish a joint occupation of the Oregon Country.
D) Spain and the United States agreed to divide Texas evenly to stave off further conflict.
E) Spain and Mexico joined to condemn Napoléon's designs on New World expansion.