Which of these is the BEST way to rewrite the sentence in line 35?

35. When he was only thirty years old, contracted an illness called tuberculosis.

Which of these is the BEST way to rewrite the sentence in line 35?

A)
Although he was only thirty years old, contracted an
A)
Although he was only thirty years old, contracted an illness called tuberculosis.

B)
When he was only thirty years old, he contracted an illness called tuberculosis.

C)
Contracting an illness when he was only thirty years old called tuberculosis.

D)
An illness called tuberculosis, contract when he was only thirty years old.