Here's why:

* Cyclopropane's Structure: Cyclopropane is a three-carbon ring, with each carbon atom bonded to two other carbon atoms and two hydrogen atoms.

* Bonding: Each carbon atom forms four covalent bonds (single bonds), three with other carbons and one with a hydrogen.

Therefore, there are three C-C bonds and three C-H bonds, totaling six covalent bonds in a cyclopropane molecule.