Answer:
C. Research what has been done in the past to clean up oceanic oil residue.
Step-by-step explanation:
To develop new technologies to reduce ocean pollution, scientific research needs to be done, gathering information on ocean pollution and what has already been implemented to alleviate or eliminate these problems. This way, the engineer will know which technologies were successful, which were unsuccessful and what was the methodology used by these previous technologies. Knowing the methodology, the engineer will be able to take inspiration from the concepts to form his own technology and from there to perform tests to verify its efficiency.