Answer:
(b). and (c).
Step-by-step explanation:
Offshore oil production involves drilling below the sea bed level and involves exploration and extraction of petroleum.
The production also applies to drilling beneath lakes or inshore waters.
The major challenges which it presents are in the form of difficulty of assembling human resources at such a site and movement of supplies and transportation i.e logistics.
Off shore oil production thereby involves huge cost and immense efforts.
Thus, off shore oil production presents both human resources and logistics challenges.