Which of the following is a type of metamorphic rock formed from limestone?

Marble is indeed a type of metamorphic rock that is formed from limestone through the process of metamorphism. This transformation occurs when limestone, primarily composed of the mineral calcite, is subjected to high pressure and temperature conditions over time. During this process, the calcite crystals in the limestone recrystallize, resulting in the formation of marble, which can be characterized by its interlocking calcite grains and often features a variety of colors and patterns due to impurities present in the original limestone.

Granite is an igneous rock formed from the slow crystallization of magma beneath the Earth's surface. Slate is another metamorphic rock, but it originates from shale, not limestone. Pumice, similarly, is an igneous rock that forms from volcanic lava and has a very different composition and texture compared to metamorphic rocks. Therefore, marble is the correct answer, as it is the only rock listed that is directly derived from limestone through metamorphic processes.