Why did the kellogg briand pact prove to be ineffective?

Although it was considered a good pact and it was signed by many countries, that was one fundamental flaw in the Kellog-Briand Pact that was certainly its doom and with that flaw, it could never work.

The pact lacked any means to prevent wars or enforcing peace.

Although it was used later on as base for other pacts and laws, the Kellog-Briand pact itself was considered a failure.

d is the answer. leo should include the source.