Jensen's level I and level II abilities can be best understood in terms of which of the following?
(a) Difficulty and complexity of tasks
(b) Socioeconomic differences
(c) Racial differences
(d) Geographical differences
Choose the correct option:
1
(a), (c) and (d) only
2
(a), (b) and (c) only
3
(b), (c) and (d) only
4
(a), (b), (c) and (d)