Ritey and Morgan recently divorced. Riley is suppose to pay Morgan child support of $$800$ a month. However Riley is asked the basic amount be reduced since he is facing undue hardship. Which of the following situations give rise to undue hardship which will reduce the amount Riley would have to pay.

a$)$ With interest rates doubling in the last year, Riley's total debt payments have become unmanageable.

b$)$ Riley quit his high paying job voluntarily to pursue a less stressful job but the income is significantly lower

c$)$ Most of Riley's income is from investments. His portfolio's value is significantly lower than his cost. He doesn't expect it to rebound any time soon.

d$)$ Riley is renovating his home and incurring significant unexpected costs and is finding it difficult to manage