A molecule has a carbon atom that is best described by sp2 hybridization. how many other atoms are connected to this carbon? three one four two

Three atoms can be connected to the carbon atom with sp2 hybridization of a molecule. As sp2 hybridization for three sp2 hybrid orbitals which can only be connected to three other atoms. As an example is the ethene molecule (C2H4) which have 2 Carbon atoms with sp2 hybridization and one Carbon atom is connected with two hydrogen atoms and one carbon atom.