Final answer:
The evidence to support the conclusion that the Olmecs were a "mother culture" of the Mayas is found in their construction of large stone heads, which reflects their cultural and artistic influence on later Mesoamerican civilizations, particularly the Mayas.
Step-by-step explanation:
The Olmecs, often considered a "mother culture" in Mesoamerica, influenced subsequent civilizations such as the Maya in numerous ways. This influence is evidenced by the spread of Olmec cultural elements including religious practices, trade networks, and artistic styles. The construction of large stone heads is representative of the iconic artistic legacy the Olmecs left behind. These heads reflect the artistic and cultural influence that the Olmec had over later civilizations, including the Mayas. Therefore, option d) The Olmecs were known for the construction of large stone heads provides evidence supporting the conclusion that the Olmecs were a "mother culture" to the Mayas, due to the long-lasting impact of their monumental art and the cultural traits that were adopted by subsequent civilizations. Olmec legacy includes religious icons, their system of trade, and hieroglyphic writing, elements that would be seen in the Mayan civilization as well.