A student who works hard to achieve good grades for the sole purpose of pleasing his parents would be said to have

Extrinsic motivation

Explanation:

Extrinsic motivation is a reward driven behavior. It is a scenario where an individual does a task solely for the aim of being rewarded, the reward they would get afterwards is their motivation, if there is no reward, they won't do it.

A student who works hard to achieve good grades for the sole purpose of pleasing his parents would be said to have Extrinsic motivation.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

answer; cultural trait;