The reason that Jerry thinks that the beach where his mother sits is "not his beach" is D. That beach is a safe place; he wants to go to the tunnel where there is adventure.
For Jerry, that beach where his mother sits is a safe place. He wants to go to the tunnel where there is adventure because swimming through the tunnel proves his manliness.
Paragraph 30 illustrates what adolescents feel when they come of age, as captured by Doris Lessing in her 1955 short story titled, "Through the Tunnel".
Thus, the tunnel proves an avenue for Jerry to demonstrate that he has become a man since he can swim through the dangerous tunnel instead of staying on the beach with his mother.
Learn more about coming of age at https://brainly.com/question/17298851
