Explanation:

Given that GOURD is written as 21-4-5-10-24
We know Vowel A, E, I, O, U and its position 1, 2, 3,4,5
according to this Alphabet position is written as A= 26 , B=25, C= 24 , D= 23 ..... and Z=1 .
then GOURD is written as
used position G= 20, O= 4, U = 5 , R= 9, D= 23
So, GOURD is written as 21-4-5-10-24 (here Consonant increase 1 position and vowel used same position)
then BRINJAL is used position B= 25, R= 9, I= 3, N =13 , J= 17,A=1, L =15.
so BRINJAL is written as 26-10-3-14-18-1-16 (where consonant increses 1 positon of alphabet position and vowel used same position )
therefore Option (B) 26-10-3-14-18-1-16 Ans