Number of letters skipped between adjacent letters in the series is in the order of 2, 5, 7, 10.
Which of the following series observes the rule given above ?

Answer: C. QTZHS
Q R  S T U  V  W  X  Y Z A  B  C  D  E  F  G H I  J  K  L  M  N  O  P  Q  R S
  2   5   7   10