Statement-1: Atomic orbitals are monocentric while molecular orbitals are polycentric,

Statement-2: In an atomic orbital, the movement of an electron is influenced by only one positive nucleus while that of an electron in a molecular orbital is influenced by two or more nuclei depending on the number of atoms contained in the molecule.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Due to the influence of one nucleus on atomic orbitals, which are monocentric, and two or more nuclei on molecular orbitals, which are polycentric. The quantity of atomic orbitals determines how many molecular orbitals are created. When two atomic orbitals merge, they create two molecular orbitals.

Hence correct option is A.