A Is the Owner of a Parcel of Land

A is the owner of a parcel of land. B, with a gadget to detect hidden treasure and used the instrument to determine if hidden treasure is found in A's land which proved positive. With A's consent, B extracted the hidden treasure. Is B entitled to 1/2?

A) No, because he is not a finder by chance due to his intention.
B) No, because he should have found it by sheer luck.
C) Yes, because he is a finder by chance even if he had the intention to look for it as it is enough that he had the intention to look for it.
D) No, he is entitled merely to compensation for his efforts.