The answer is A: were culturally and linguistically diverse.
Explanation for each option:
A. Were culturally and linguistically diverse: This is correct. Civilizations in the Americas, such as the Maya, Aztec, and Inca, had distinct cultures, languages, and social structures. For example, the Maya civilization had its own writing system and calendar, while the Inca used a system of knotted strings called quipu for record-keeping.
B. Developed writing at the same time: This is incorrect. Different civilizations in the Americas developed writing systems at different times. The Maya, for instance, had a sophisticated writing system by the 3rd century AD, while other civilizations like the Inca did not develop a traditional writing system but used quipu.
C. Communicated in the same language: This is incorrect. The civilizations in the Americas spoke a variety of languages. For example, the Aztecs spoke Nahuatl, the Maya spoke various Mayan languages, and the Inca spoke Quechua.
D. Didn't have organized religion: This is incorrect. Many civilizations in the Americas had complex and organized religious systems. The Aztecs, for example, had a pantheon of gods and conducted elaborate religious ceremonies, including human sacrifices. The Maya also had a rich religious tradition with a detailed mythology and a priestly class.
In summary, the civilizations in the Americas were indeed culturally and linguistically diverse, making option A the correct answer.