Magma that squeezes into a horizontal crack is called a magma that squeezes into a vertical crack is called a

Magma that squeezes into a horizontal crack is called a sill. Magma that squeezes into a vertical crack is called a dike.

They are both considered volcanic rocks that form into layers of another rock. In nature, the difference is that sills are horizontal while dikes are vertical.

Why you put last one a? i think is b.