In "I Am Malala," Dr. advised Malala's father on how to care for her, which could refer to option D. However, the most prominent unusual action taken by a doctor during Malala's treatment was likely B, as it involved transferring her to a hospital in the UK that was safer and better equipped for her serious injuries. This decision was crucial in ensuring her survival and recovery.
So, the best choice would be B. Transferred Malala to a hospital that was safer.