Answer:
B. Some sports cars are red things
Step-by-step explanation:
The proper standard form for the statement "some sport cars are red" is some sport cars are red things.
Note that things as used here is universal, it covers all. Since some sport cars are red, it follows that some sport cars are red things.
Option C is wrong because it contradicts the initial statement which states that some and not all sport cars are red.
Option A is also wrong in that since some sport cars are red, some sport cars are also red thing.