Gloat in the sentence means to brag. Basically, the third selection. "To make fun of someone."
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The answer is in the screenshot. I hope this helps :)
Churchill was a British prime minister. While France is being attacked, Great Britain is all in danger because They are just to the North of France across the English Channel.
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The Earth'sinterior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball, about 1,500 miles (2,400 kilometers) in diameter. ... Above the inner core is the outer core, a shell of liquid iron.