Question: What theory is outlined related to the formation of the Washington Scablands? Choose the BEST answer. A. The Scablands would have needed millions of years for geological processes to gradually build up the amount of erosion seen on the landscape B. The Scablands show the power of gradual erosion to shape the landscape, but may have been formed far more quickly than was previously thought C. The Scablands can only be explained by the catastrophic collision of an asteroid D. The Scablands can only be explained by the impact of catastrophic flooding combined with longer term processes of gradual erosion. Need Assignment Help?