the most significant developments were the use of stone tools for hunting and gathering. Toward the end of hunter/gatherer societies they developed the use of agriculture and the domestication of plants and animals which led to the end of nomadic lifestyles.
If there was a graph, it would be more helpful, but I believe the answer would be A. If you could provide the graph, I would correct myself if I am mistaken.
"Loyal dialects" would be the only plausible option, since the Philippines are comprised of thousands of islands each with a unique past. "Tagalong" is the primary language.
