Based on the provided context in the answers for related questions, the transaction experiences significant deficits by Year 5, resulting in principal shortfalls for both senior and junior bondholders. Consequently, the equity holders would receive no principal repayment at the end of the transaction's life, leaving them with only the excess spread generated in the first three years. This total loss of principal would result in a highly negative Internal Rate of Return (IRR) for the equity tranche.

(Note: The exact cash flow table is missing from the provided text, but among the choices, a negative IRR is the most mathematically consistent with a total principal loss scenario described in the answers.)