Which of the following statements is true about covalent bonds?

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A covalent bond is a chemical bond that is formed when two atoms share electrons in their outermost shells. These shared electrons are called shared pairs.
Sigma bonds are the strongest covalent bonds and are due to head-on overlapping of orbitals on two different atoms. A single bond is usually a sigma bond.
Covalent bonds are also affected by the electronegativity of the connected atoms, which determines the polarity of the bond. Two atoms with equal electronegativity will make nonpolar covalent bonds such as H-H. A molecule that does not share electrons "equally," such as H2, creates a polar bond. A polar bond is characterized by one of the atoms in the molecule having a stronger "pull" on the shared electrons. This results in some atoms in the molecules having a slightly negative charge and others having a slightly positive charge. In the case of water, the oxygen atom end sup with a slight negative charge because it pulls the shared electrons with Hydrogen closer to itself. This results in the hydrogen atoms having a slightly positive charge do to the imbalance.
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Which of the Following Statements Is True About Covalent Bonds