Answer:
C) It is abundant and affordable.
Step-by-step explanation:
Keep in mind that this refer to the population growth after 2010s.
Compared to land in New York or California for example, Texas still typically very affordable and the difference ratio between land and number of population still really low.
I will provide the reasons why other options are wrong:
A) It features fertile soil.
Technically yes. But this will not be the main reason for settlement. States such as Tenseness will be more lucrative for agricultural purposes
B. It sits in a pleasant climate
This is not true. The climate in Texas is typically hotter than average.
D. It lies over oil and natural gas.
This would be the answer if it refers to the population growth in 1800s, during settlement era. Not so much in 2010s, since most of it are already claimed by either the government or private companies.