Simple molecules and covalent bonds — practice question

Which row gives the description of how single covalent bonds are formed in methane?

• Aatoms share a pair of electrons / both atoms gain a noble gas electronic structure
• Batoms share a pair of electrons / both atoms have the same number of electrons in their outer shell
• Celectrons are transferred from one atom to another / both atoms gain a noble gas electronic structure
• Delectrons are transferred from one atom to another / both atoms have the same number of electrons in their outer shell