What is the expectations theory? What is the formula? Why does the solution show them dividing the 3rd year by the 2nd year?

MC Qu. 20 The following is a list of prices... The following is a list of prices for zero-coupon bonds with different maturities and par value of $1,000 Maturity CYears) Price $943.40 $881.68 $808.88 $742.09 What is, according to the expectations theory, the expected forward rate in the third year? 0 7.00% o 733% 9.00% 11.19% None of the options 881.68/808.88-1-996