In Simons and Chabris's "Change Blindness" Experiment,participants Watch a Film

In Simons and Chabris's "change blindness" experiment,participants watch a film of people playing basketball.Many participants failed to report that a woman carrying an umbrella walked through because the

A) woman with the umbrella was in motion,just like the players.
B) the umbrella was the same color as the floor.
C) participants were counting the number of ball passes.
D) participants were not asked if they saw anything unusual.