Final answer:
The anthropological studies support the statement that sexual activity and sexual responsiveness are culturally-patterned, as evident through various societal interpretations of sexuality and sexual behavior.
Step-by-step explanation:
The anthropological studies of sexual behavior in Mangaia, Polynesia, and Inis Beag, Ireland, provide evidence that sexual activity and sexual responsiveness are culturally-patterned. This is because each society interprets sexuality and sexual behavior in its own distinctive ways, with varying attitudes and practices surrounding phenomena such as premarital sex, the age of sexual consent, and homosexuality. Margaret Mead's research, as well as those by other anthropologists, have demonstrated that societies construct sexual norms and values that are intertwined with their culture and social systems.
Answer: D) Sexual activity and sexual responsiveness are culturally-patterned.