please answer fast, will upvote!

28 At the end of last year, Dawn had unused RRSP contribution room of $4,000. Last year, she had earned income of $85,000 and she was a member of her employer's defined benefit pension plan, which will provide a benefit of 1.5% of average earnings for each year of service. This year, Dawn made an additional contribution to the pension plan to purchase past service credits and this resulted in a past service pension adjustment of $2,000. If the RRSP dollar limit was $26,230 for last year and $26,500 for this year, what is Dawn's RRSP contribution room for this year? O a) $2,425 b) $6,425 Oc) $10,425 d) $10,875