If it is possible to make a meaningful word with the 2nd, the 6th the 9th and the 12th letters of the word 'CONTRIBUTION', which of the following will be the last letter of that word? If more than one such word can be formed, give 'M' as the answer and if no such word is there, give 'X' as the answer.

the pattern is ... babc

All are rodents or rat family, except cat.

Barrow' is man-driven cart whereas others are usual.

Except option (d), all letters in pairs having difference of four.

The relationship is x : (x² - 9).

63/3 = 21
27/3 = 9

F

Except option (c) rest all are perfect squares.

Except, `Plate', all two in number.

All other terms are used to denote the size.