Which of the Following Is True About Attention

Which of the following is true about attention?

A) The more difficult the competing tasks are,the more effectively older adults divide attention than younger adults.
B) When the two competing tasks are reasonably easy,age differences among adults are minimal or nonexistent.
C) On simple tasks involving a search for a feature,age differences are dramatic even when individuals are given sufficient practice.
D) Generally,older adults are more adept at selective attention than younger adults are.