Select the correct answer. Read the passage, and then answer the question.
A team of scientists studied the sediment at the bottom of an ancient lake. They were able to determine the weather conditions of the Indus
valley in ancient times. They found that the entire area had suffered a drought after the monsoons declined. This drought lasted 200 years.
Because of the drought, there wasn't enough food or water. The people of the indus valley were forced to leave their cities.
What theory about the cause of the decline of the indus civilization does the passage support?
ОА
climate change
OB
Invasion by an outside force
Ос.
rivers changing course
spread of introduced diseases
D

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.

d

explanation: