In which one of the following is a great dark plain called “Maria” found?

The great dark plains known as "Maria" (singular: mare) are found on the Moon. Derived from the Latin word for "seas," these vast, flat plains were historically misidentified as bodies of water by early astronomers due to their smooth, dark appearance [t1][t5]. Scientific studies and lunar missions, such as the Soviet Luna program and NASA's Apollo missions, confirmed that these regions are actually ancient basaltic lava flows [c5][t1]. Maria cover approximately 15–17% of the lunar surface and are predominantly located on the Moon's near side, which faces Earth due to tidal locking [c3][t1][t4]. They formed billions of years ago when large meteorite impacts created deep basins that were subsequently filled with iron-rich volcanic basalt [t1][t3]. Notable examples include the Sea of Tranquility, where the first human lunar landing occurred [t1].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Colonizing the Moon > p. 29
2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 19: The Motions of The Earth and Their Effects > Phases of The Moon > p. 257
3. [3] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/lunar-maria