Answer: Carbon and hydrogen
Step-by-step explanation:
Covalent bonds are formed by sharing of electrons between non metals.
A polar covalent bond is defined as the bond which is formed when there is a significance difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the unequal sharing of electrons between the atoms.
Non-polar covalent bond is defined as the bond which is formed when there is no or little difference of electronegativities between the atoms. It is also defined as the bond which is formed due to the equal sharing of electrons between the atoms.
As electronegativities of carbon (2.6) and hydrogen (2.2) are quite near to each other , they will form a non polar covalent bond.