已知变量words = 'acdicacacdi',当执行下述语句后: words = 'acdicacacdi' if words.count('ac') >= 3: print(words.replace('a', 'x')) elif words.count('ac') < 3: print(words.replace('c', 'y')) else: print(words) 输出结果为() A. aydiyayaydi B. B.xcdicxcxcdi C. .acdicacacdi D. D.输出为空