As of March 12, 2020 the yield to maturity on 30 year US Treasury Bonds was 1.44%. On the same date, the yield to maturity on 30 year TIPS (Treasury Inflation Protected Securities) was 0.31%. The latter can be viewed as a real interest rate. What forecast inflation rate is implied by these interest rates

The forecast inflation rate is implied by these interest rates is 1.13%

Explanation:

when dealing with inflation, we have that:

(1 + nominal interest rate) = (1 + real interest rate) * (1 + inflation rate)

                              1.0144 = 1.0031 * ( 1 + inflation rate)

                   inflation rate = 1.0144/1.0031 - 1

                                         = 1.13%

Therefore, The forecast inflation rate is implied by these interest rates is 1.13%

it's obviously d. it could be c though.