Correct Answer: 94265

Solution : Given:

ANCIENT is coded as 2516859 and NATURE is coded as 529048

The code of letters in the given word ANCIENT is A → 2; N → 5; C → 1; I → 6; E → 8; N→ 5; T → 9

The code of letters in the given word NATURE is N→ 5; A → 2; T → 9; U → 0; R → 4; E → 8

The code of the letters of TRAIN can be taken from the letters of ANCIENT and NATURE.

The letters of TRAIN will be coded as T → 9; R → 4; A → 2; I → 6; N → 5

So, TRAIN will be coded as 94265 .

Hence, the third option is correct.