A Leased a Parcel of Land to B

A leased a parcel of land to B. Without A's consent, B constructed a warehouse. What is the nature of the warehouse?

A) It is a personal property because the builder was in bad faith.
B) It is a personal property because the builder is not the owner.
C) It is immovable because the only criterion is union or incorporation with the soil. (Ladera v. Hodges (CA) 48 O.G. 4374)
D) Personal because it is a structure which can be removed by the builder.