Add place value of all the alphabets and subtract 5 from it.
Donkey:
(4 + 15 + 14 + 11 + 5 + 25) - 5
= (19 + 14 + 11 + 5 + 25) - 5
= (33 + 11 + 5 + 25) - 5
= (44 + 5 + 25) - 5
= (49 + 25) - 5
= (74 - 5)
= 69
Snail:
(19 + 14 + 1 + 9 + 12) - 5
= (33 + 1 + 9 + 12) - 5
= (34 + 9 + 12) - 5
= (43 + 12) - 5
= 55 - 5
= 50
So, the "PARROT' will be coded as,
(16 + 1 + 18 + 18 + 15 + 20) - 5
= (17 + 18 + 18 + 15 + 20) - 5
= (35 + 18 + 15 + 20) - 5
= (53 + 15 + 20) - 5
= (68 + 20) - 5
= 88 - 5
= 83
Hence, the correct answer is "83".