Correct Answer: 85

Solution : Given:
REINER is written as 75, and SARA is written as 43.

Add the position value of the letters of the given word REINER then, add the total number of letters in the word to obtain the required code –
R→18; E→5; I→9; N→14; E→5; R→18
Now, add the position value of the given word REINER then, add the total number of letters in the word –
(18 + 5 + 9 + 14 + 5 + 18) + 6 = 69 + 6 = 75
Thus, REINER is coded as 75.
And, SARA is coded as 43 –
S→19; A→1; R→18; A→1
Now, add the position value of the given word SARA then, add the total number of letters in the word –
(19 + 1 + 18 + 1) + 4 = 39 + 4 = 43
Thus, SARA is coded as 43.
Similarly, follow the same pattern for CHRISTA →
C→3; H→8; R→18; I→9; S→19; T→20; A→1
Now, add the position value of the given word CHRISTA then, add the total number of letters in the word –
(3 + 8 + 18 + 9 + 19 + 20 + 1) + 7 = 78 + 7 = 85

So, CHRISTA is coded as 85. Hence, the first option is correct.