Assertion : Both true ribs and floating ribs are present in mammals. Reason : By nature, sternal ribs are true ribs as, they possess all the characters of ribs.

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