When Is Search Easier (I

Multiple Choice

When is search easier (i.e., more likely to be parallel)

A) when distractors are homogeneous and targets are defined by having a feature present
B) when distractors are heterogeneous and targets are defined by having a feature present
C) when distractors are homogeneous and targets are defined by having a feature absent
D) when distractors are heterogeneous and targets are defined by having a feature absent