The answer is D: around 1915
I believe the answer is Corpus delicti but I'm not certain.
The answer to the first unknown is "FRATERNAL TWINS" while in the second unknown is "SISTERS". Hence, we have it, Mia and Thalia are very similar to each other especially with respect to their appearances and to each other in the personality trait of openness. While Esther and Hannah are less similar to one another in openness. We can say that Mia and Thalia could be FRATERNAL TWINS, whereas Esther and Hannah could be SISTERS.
