【单选题】In this text the author tells us about ___________.
A.
how he suffered in prison on Robben Island and how he fought against the cruel prison warders who forced him to do manual labor under harsh conditions
B.
how he pursued what became his two favorite hobbies in prison: gardening and tennis
C.
how he managed to find meaning and pleausre in his everyday life during his long imprisonment
D.
how he took advantage of the prison authorities' permission to start a garden in the courtyard and what he learned and hwo he benefited from his gardening experience