The textbook notes that the last time a major league batter hit .400 was in 1941. This is because:
A.baseball diamonds have become larger.
B.the league imposes harsh penalties for steroid use.
C.the average quality of batters has fallen.
D.specialization by pitchers, infielders, and outfielders has made it harder for batters to hit.
正确答案：specialization by pitchers, infielders, and outfielders has made it harder for batters to hit.
