From the sentence 'Like many other single men in their middle age, he was getting rather set in his ways' we learn that ______.
A.
Middle-aged men are likely to have different ways of living
B.
Many other single men in the world would rather live like Jonathan
C.
Jonathan liked to do things in the same way as other middle-aged single men did
D.
Jonathan was getting into the habit of doing things in the same way every day