Children sitting in the same room, taught by the same teacher from the same book, do not learn equally well or equally fast. Psychology explains this by the fact that learners are unlike one another in intelligence, aptitude, span of attention, earlier knowledge, speed of work and emotional make up.

Because these variations lie inside the learner, the capacity to learn is decided chiefly by them. This is also the reason teaching is expected to be adapted to the level of each child, with slower learners given more time and abler ones given enriched work, instead of being pitched at one average level for the whole group.

Mixing with others, the home and the cultural surroundings do shape attitudes, language and opportunity, and they can help or hinder the use a learner makes of capacity. Yet two children of the same household and the same culture still differ widely in how much they learn, which shows that these outer conditions are supporting influences rather than the deciding one.

Individual difference option is correct.