Final answer:
Primates have long growth and development periods due to complex social structures and behaviors. They live in social groups and have prolonged periods of dependency on adults, providing extended opportunities for learning. Hence the correct answer is option C
Step-by-step explanation:
Primates have long growth and development periods primarily due to complex social structures and behaviors. Most primates live in social groups and have prolonged periods of dependency on adults, which provide extended opportunities for learning. Additionally, primates have relatively large brains and high intelligence, which require longer periods of development.
Hence the correct answer is option C