The articles of the texas constitution that define the creation and structure of counties in the state provide for a fairly system that counties are required to abide by.

a. flexible
b. inflexible
c. simple
d. centralized

b. inflexible          

Explanation:

The Texas Constitution was adopted and came into effect in the year 1876.It is the legal document of the Government of Texas according to which the different structures and the function of Texas Government works. The Texas constitution is considered to be a rigid constitution and is inflexible as the United States Constitution. The Texas Constitution was written in a way that it makes it both fairly easy to amend and a highly restrictive in  powers that it grants, thus making it frequent and highly specific changes necessary.

Thus the answer is -- (b). inflexible

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