The binding energy per nucleon, for nuclei with atomic mass number `A gt 100`, decreases with `A`.
The nuclear forces are weak for heavier nuclei.
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 are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If Assertion is false but Reason is true.