Look at this series: 40, 44, 48, __, 52, 56, 40, 60, ... What number should fill the blank?  Pick: A) 60 B) 50 C) 40 D) 46 E) 52
40   40   In this series, 4 is added to the previous number; the number 40 is inserted as every third number.
<result>C</result>
Look at this series: 40, 44, 48, __, 52, 56, 40, 60, ... What number should fill the blank?