What is best considered a statement of public interest

How did the union blockade of the southern coast affect the confederacy? it forced the confederacy to build new railroads. it contributed to shortages of weapons and food. it encouraged europe to trade with the south. it halted all trade, leaving the south without supplies.

What two things did former british prime minister winston churchill affirm in his iron curtain speech?

Which of the following statements is true of cause and effect relationships