C

To determine the correct options based on the thermal energy changes and final temperatures, we proceed as follows:

Step 1: Understand the specific heat capacities of the liquids:
Let the specific heat capacity of liquid C be S_C. Then:
S_A = 2S_B = 4S_C
Therefore, expressed in terms of S_C, we get:
S_A = 8S_C, S_B = 4S_C, S_C = S_C.

Step 2: Analyze thermal energy changes in each case:
(i) When A and B are mixed:
The final temperature will not be extremely high due to A's lower heat capacity.

(ii) When B and C are mixed:
They both have moderate heat capacities, the final temperature will shift upwards significantly. Thus, this option is plausible but requires further evaluation.

(iii) Final temperature when all are remixed:
This will yield a temperature that averages their contributions, likely higher than both previous mixes but needs precise calculation.

(iv) Final temperature for B and C:
Given B is warmer and has more specific heat than A, the final temperature will pull towards C, ultimately leading us to understand that B and C's mixture raises the temperature effectively.

Conclusion: Based on the analysis, option [C] (B and C mixed) leads to a final temperature that is most relevant to our evaluations. Therefore, the correct choice for the final temperature is [C].