Answer:
C. Lincoln sent the federal army into Texas to monitor the Texas Secession Convention in Austin
Step-by-step explanation:
Lincoln Offered Texas the federal army, in order to increase the security during the convention. But the offer were rejected because they believe that the presence will only increase the hostility among the locals.
In the end, the convention run rather peacefully. But, the convention was overwhelmingly filled with the supporters of the Secession. In the end, the state votes to separated from the Union and this become of the biggest reason for the civil war.