Given are two simple sentences, decipher which of the following is correctly combined complex sentence by using an adjective clause?
Separate: I saw a car. It was black in colour.

A. I saw a car in black colour.

B. I saw a black coloured car.

C. I saw a black car.

D. I saw a car which was black in colour.

Please do not use chat terms. Example: avoid using "grt" instead of "great".