The correct answer is B) The incident exposed London's need for medical personnel training related to terrorist attacks.
The London subway bombings resulted in new First Aid measures being enacted because the incident exposed London's need for medical personnel training related to terrorist attacks.
After the London bombings of July 7, 2005, many lessons were taught to London, police and medical emergency services. It served to change response actions to those kinds of terrorist attacks.
The medical response was late that day. So ambulance response had to be improved. Protocols for major accidents changed. Tube stations were numbered due that some ambulances were sent to the wrong subway stations locations. Communications inside the underground were deficient or nonexistent, so the communication system was also changed.