Concept:This is a sentence rearrangement test to form a logical sequence.
The correct order must flow naturally from the invention of the wheel to its direct effects.
Explanation:Sentence 1 says the wheel changed the world.
P (Transport became easier) is the first effect of the wheel.
R (Travel became faster) builds on easier transport.
S (Roads improved quickly) is a result of faster travel.
Q (Machines could now be built) is the broader impact, leading to sentence 6.
Thus the logical order is P → R → S → Q.
Answer:Option B (PRSQ)