I believe the answer is: increasing generalizability
Generalizability refers to the extend that a conclusion of a research could be applicable to different people. As generalizability goes higher, The reliability of the measurement would be increased. and it could easily be replicable even if the test subjects are drastically altered.
The correct answer is the E. The ashes released by this explosion acted as an obstacle to the passage of the sun's rays and this caused a drop in temperature resulting in a “volcanic winter”. After the explosion of the Toba volcanic the average temperature dropped to about 3 to 3.5 °C, which represents a drastic change for the populations and lasted about six to seven years. This volcanic winter not only affected the local population, but it was a fact with global consequences. This caused the extinction and the diminution of the population to great scales in several Homo species that existed.
Around Iraq is when the first civilizations appeared. Around the Mosul and nineva area
