Considering orbitals resulting from the overlap between typical atomic orbitals of organic compounds, analyze the following sentences: I- The pi bonds of the methane molecule, CH4, are formed by the overlap of the 1s orbitals of hydrogen with sp3 hybrid orbitals of carbon. II- The C-C sigma bond in the ethane molecule, C2H6, is formed by the overlap of the two sp3 orbitals of carbon atoms. III- The C-H bond in the ethane molecule, C2H6, is formed by the overlap of the hydrogen 1s orbitals with sp3 hybrid orbitals of carbon. Choose the CORRECT alternative:

I- The pi bonds of the methane molecule, CH4, are formed by the overlap of the 1s orbitals of hydrogen with sp3 hybrid orbitals of carbon.
II- The C-C sigma bond in the ethane molecule, C2H6, is formed by the overlap of the two sp3 orbitals of carbon atoms.
III- The C-H bond in the ethane molecule, C2H6, is formed by the overlap of the hydrogen 1s orbitals with sp3 hybrid orbitals of carbon.
A) Sentences I and II are correct.
B) Sentences I and III are correct.
C) Sentences II and III are correct.
D) Only sentence II is correct.