You must drive at a speed
a. that you think is safe
b. slower than most vehicles on the roadway
c. at least 5 mph above the speed limit
d. that is reasonable for the current road conditions

The correct answer is option d. "that is reasonable for the current road conditions".

Explanation:

The Basic Speed Rule in Texas is that a driver should not drive at a speed greater than is reasonable and prudent under the circumstances at the moment. The idea is to be able to stop in any hazardous situation that could potentially happen in the road. Therefore the driver should drive at a speed that is reasonable for the road conditions, the speed and volume of the traffic, weather conditions and in the possibility of encountering any actual or potentials hazards on the road.

that’s the kind of bug henry was; and if we’d a had him along ’stead of our kings, he’d a fooled that town a heap worse than ourn done.”

your eyes are the first things that you open