Answer:
a. Stage II
Step-by-step explanation:
Stage 0 includes tumors only in top layers of skin.
Stage I includes tumors grown below skin of penis but not into the deeper layers.
Stage II penile cancer includes the tumors which have grown deep into tissues of penis or urethra. This is the stage where the tumor has reached the shaft of the penis.
Stage III penile cancer reached nearby lymph nodes in groin.
Stage IV penile cancer includes groups of more advanced cancers.