Look at this series: V, __, XI, XIV, XVII, XX, ... What number should fill the blank? Choose one:	A) IX	B) XXIII	C) XV	D) VII	E) None
Explanation: This is a simple addition series; each number is 3 more than the previous number.   Answer: VII
<result>D</result>
Look at this series: V, __, XI, XIV, XVII, XX, ... What number should fill the blank?