Help me plz*crys* What technique did American Abstract Expressionist Jackson Pollock use to apply paint to canvas?

Autumn Rhythm (Number Thirty), painting by Jackson Pollock, showing black, white and brown line pattern

carefully placing brushstrokes to create the illusion of motion on the canvas

using soft sponges and housepainting brushes to apply diluted oil paint and watercolor

using sticks and brushes to drip and splatter paint on canvas that was on the floor

stapling a large piece of canvas to the wall and flinging paint by using the full motion of his arm

Dr. laguardia is a cognitive neuroscientist who is interested in the effect of brain concussions on the ability to recognize faces. he conducts a quasi-experimental study in which he examines football players before and after the regular season using the benton facial recognition test (a published, widely used measure of one's ability to recognize faces) to compare those who received concussions to those who did not. he finds that players who had concussions during the regular season performed worse on the benton facial recognition test than did players who did not experience which of the following is true regarding external validity in dr.laguardia's study? a. because dr. laguardia selected participants who actually experienced concussions, the study b. because dr. laguardia's study is a quasi-experiment, it is impossible to obtain c. because dr. laguardia's dependent variable was assessed in the laboratory, the study d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.