Answer:
B. Budd Abbott and Lou Coastelle
Step-by-step explanation:
The subject of a sentence is the person, thing or idea that does something and a compound subject refers to a subject that has two or more simple subjects that are joined by a conjunction.
In this sentence and considering the definitions above, the subject is Budd Abbott and Lou Coastelle and it is a compound subject because it has two simple subjects and it is joined by the word "and" that is a conjunction.