Pls help me ASAP Which of the following best explains how the discovery of oil at Spindletop helped change Texas from a rural to an urban state?

A- The growth of oil companies into other industries led to an increase of jobs.

B- The discovery of oil made Texas the new home of the successful automobile industry.

C- Oil companies built railroads to carry workers from out of state.

D- The country's need for Texas oil led to an increase in government grants.