While some academicians believe that the business ethics should be intergrated into every business course, other sat that students will take ethics seriously only if it would be taught as a separate required course.
B only if it is taught as a separate, required course
You want to use required as a participle defining COURSE
C if it is taught only as a course required separately
It's not HOW the course is TAUGHT that's important - it's the fact that the course BE TAUGHT Separately that's important
D if it was taught only as a separate and required course
placement of only. besides you want adverbs to modify the verb taught.
E if it would only be taught as a required course, seperately
got this wrong, explanations would be helpful.
Most of the choices play with the placement of ONLY. B is the only one making sense.