Investing in bonds! pls

1.) ralph wishes to protect his investment from inflation. he buys a zero coupon bond. why is this investment a bad choice for ralph?

2.) allison buys a greek treasury bond. the greek government announces that it is defaulting on its debt. what options does allison have to recover her money?

3.) why are municipal bonds less attractive to foreign bondholders?

4.) why does building a ladder of bonds protect against changes in interest rates?