In a certain code, MENTION is coded as LNEITNO and FIGHT is coded as EGITH. How is PATTERN coded in that code?

Since the first letter of the word and code are different, while the rest of the letters seem to be rearranged, split the first and rest of the letters.

By observation, split MENTION as M EN TI ON.

Now, it is clear that M is replaced by the previous letter (L) and the remaining pairs are reversed i.e. NE IT NO.

Hence, MENTION becomes LNEITNO. Similarly, FIGHT is first split as F IG HT.

Now, F is replaced by the previous letter (E) and the remaining pairs are reversed i.e. GI and TH

Hence, FIGHT becomes EGITH.

Similarly, PATTERN is first split as P AT TE RN.

Using the logic explained above, PATTERN becomes OTAETNR.

Hence, option d.