Answer: it is c. Pueblo
Explanation: I took the test
I believe the answer would be C, burning fossil fuels. Oil and gas is made up of the remains of microscopic plankton. Over millions of years the remains become the carbon-rich coal, oil and gas we can use as fuel. When fossil fuels are burned they release carbon dioxide into the atmosphere, thus contributes to global warming.
This is true, not having a navy has shown itself to be a weakness of many nations/civilizations in the past. And there are also good reasons why this is so. Not having a navy strongly impacts a civilizations ability to maneuver around certain points and go around them. It also limits the ability to trade with other natons. Not to mention the additional value of having the firepower of ships (those that had cannons later on at least).
The main reason why OPEC imposed an oil embargo on the US is because the US supported Israel in its “Yom Kippur War” with Egypt, and OPEC was made up of states that were against Israel, who was fighting the war against Egypt.