What Does the Phrase "Incompatibilities Tax Attention" Mean

Multiple Choice

What does the phrase "incompatibilities tax attention" mean?

A) It becomes expensive to pay attention when data are assembled in constantly changing order.
B) It becomes expensive to pay attention when data are assembled in perfect sequence.
C) Completing a task becomes more difficult when automatic processing overtakes focused attention.
D) Completing a task becomes more difficult when information comes from an unexpected direction or location.