Read this sentence-
After graduating from high school, Kaylee's plan to attend college in Vermont and to study American literature

e. change Kaylee's plan to Kaylee plans
f. change Kaylee's plan to Kaylee's plan is
g. change Kaylee's plan to Kaylee's plan will be
h. change Kaylee's plan to Kaylee's plans

(The answer is h, but I don't know why. I hope you can explain for me)