Kitten Inc Was Contractually Obliged to Pay $5000 to Mavitten

Kitten Inc was contractually obliged to pay $5000 to Mavitten Ltd on June 1, but failed to do so. It is now June 3. Assuming that general contractual rules apply, which of the following statements is TRUE?

A) Kitten has breached a condition subsequent by failing to pay even after the scheduled date for payment has passed.
B) As a result of Kitten's behaviour, the terms of the contract have been varied.
C) Mavitten is entitled to discharge the contract for breach.
D) Mavitten cannot discharge the contract unless it notified Kitten that the time of payment was very important.
E) Kitten has committed a serious breach of contract because time is of the essence.