please answer fast, will upvote!

Emily is retired and receives benefits from the Canada Pension Plan (CPP). What statement(s) is/are true? 1. The after-tax amount that Emily receives from CPP is affected by her marginal tax rate. ii. The amount that Emily receives from CPP is affected by quarterly changes in the CPI. iii. The amount that Emily receives from CPP is not affected by the age at which she began drawing CPP benefits. iv. The amount that Emily receives from CPP is affected by her contributions during her contribution period. O a) i only Ob) il only Oc) i and iv d) il and iv