Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of Z. Reason : Electronegativity decreases across a period.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false