The statement reveals that Tarzan is reflecting on his origins and the lack of knowledge about his father, which indicates a deeper connection to his identity and heritage. Given the nature of the options provided, the most accurate interpretation is:
D) He is choosing to hide his birthright (his true identity) for the sake of Jane.
This implies that Tarzan's discussion about his mother and his unknown father signifies a reluctance to fully disclose his background, possibly to protect Jane or to navigate the complexities of his situation with her.