Which of the following is not mentioned as a global hot spot for whale collisions

A．the development of sonar technology
B．how to avoid ship and whale collision
C．the hot spots for whale collision
D．the giant creature of the sea

A．warning whales to get away from passing ships
B．attacking ambient noise imaging tags onto the whales
C．directing passing ships to turn away from the whales
D．teaching the whales to send signals to the passing ships