Sometimes Someone Notices and Perceives an Input Even Though the Input

Sometimes someone notices and perceives an input even though the input is part of a stream of information that the person has been,up to that point,successfully ignoring.A plausible explanation for this is that

A) the input the person noticed happens to be a stimulus he or she encounters frequently,and so the relevant detectors were already well primed.
B) the input the person noticed did not require any task-general resources.
C) executive control allows people to process both the attended and the unattended input.
D) the person seems to suffer from an attention disorder.