Number of the letters skipped in between adjacent letters of the series starting from behind are increased by one.
Which of the following series observes this rule ?

B. OMJFA

Number of letters skipped in between adjacent letters in the series is two. Which of the following series observes this rule ?

A. MPSVYBE

Number of the letters skipped in between adjacent letters in the series is two.
Which one of the following alternatives observes this rule ?

C. UROLIF

Number of letters skipped in between adjacent letters in the series is odd.
Which of the following series observes this rule ?

A. BDHLR

Select the series in which letters are not according to a general rule.

B. MORTVX