Why Did Mexico Begin to Encourage Settlers from America to Come

Why did Mexico begin to encourage settlers from America to come to its Coahuila-Texas region?

A) Mexico wanted to become a part of the United States and thought that having more U.S. settlers would facilitate this.
B) Few Mexicans would settle this undeveloped land because of fear of Indian attacks and lawlessness there.
C) New settlers would mean new tax revenues for the cash-strapped Mexican government.
D) Mexico wanted to establish a market for its slave trade.
E) All of these choices