This season, 14 of the 31 teams in the National Football League will be using some variant of the West Coast offense originated by Bill Walsh. The West Coast, built around a passing attack that features precision throwing and crisp, clear passing routes, can be contrasted with the older-style "Bloody Nose" offense, originated by the Chicago Bears, that relies heavily on grinding out four or five yards per down on the ground. The reason for the popularity of the newer West Coast offense is not hard to explain. Fourteen of the 31 head coaches in the league are former assistants to Bill Walsh or former assistants to head coaches who had previously worked for Walsh.
The speaker assumes that
A) the West Coast offense is the most effective offense ever used in the National Football League
B) the older-style "Bloody Nose" offense will one day be completely supplanted by the West Coast offense
C) a style of coaching is something that can be passed along from more experienced coaches to younger ones
D) a passing offense is more exciting to watch than an offense that relies primarily on gaining yards by running
E) younger football coaches study under Bill Walsh in order to learn a style of offense that they will later use as head coaches