Which of these best describes the attack on Pearl Harbor? A a false alarm B an ineffective strike a catastrophic ambush D a setback to America's war efforts​

D

Explanation:

Where's C? but D

It was unexpected and caused a setback in the United States military but that was also when they decided to join WW2. Japanese general stated we awoken a beast.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.