Why did Stephen F. Austin write a letter to the Mexican authorities in San Antonio

Why did Stephen F. Austin write a letter to the Mexican authorities in San Antonio after spending sometime in Mexico City?
a. Austin was frustrated with Santa Anna's unwillingness to pass the resolutions.
b. Austin was sick with cholera and was worried he would not make it back to Texas so he tried to
recruit help
C. Santa Anna told Austin that the only way he would pass the resolutions was if he gained the
support of people living in San Antonio.
d. Austin was frustrated with Farias's unwillingness to help pass the resolutions.