I would have to say C, Spain and France. France was visited by 85.7 million foreign tourists in 2013, making it the most popular tourist destination in the world. In 2017, Spain was the second most visited country in the world, recording 82 million tourists which marked the fifth consecutive year of record-beating numbers.
The mid-oceanic ridges underling the hot asthenosphere which creates a depression that causes the melting of the peridotites at shallow depths. As they rise that results in mafic magma and this only takes place at divergent boundaries.
Here the plates sperate and move away, causing magma below to rise and ill spaces of low pressure. The rocks then cool and new crust is firmed. The mafic rocks crystallize at higher temperatures and pressure.
