What kind of relationship is this?

police officer:patrol car

A. concrete:concrete

B. abstract:abstract

C. abstract:concrete

D. concrete:abstract

The kind of relationship that this is is A. concrete:concrete.

Both a police officer and his patrol car are concrete nouns - they exist in time and space, can be seen, touched, etc.

An abstract noun cannot - here are some examples of abstract nouns: love, hate, happiness, etc.