$$To A on the condition that the easement be maintained and should the easement not be maintained, the property shall go to the Mesa Public School District for use as an athletic field, if not use for the purpose, the Grantor has right of re$-$entry.$$ A has:

a$.$

$$A fee simple subject to a condition subsequent.

b$.$

$$A fee simple determinable.

c$.$

$$An estate for years.

d$.$

$$A life estate.