Assertion: Pyramid of energy is always upright.
Reason: When energy flows from a particular trophic level to the next trophic level, some energy is always lost at heat at each step.

(a). Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b). Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
(c). Assertion is true but Reason is false.
(d). Both Assertion and Reason are false