Why Was It Necessary to Place the Human Coding Sequence

Why was it necessary to place the human coding sequence for antithrombin next to a goat regulatory sequence in order to get it expressed in goat cells?

A) Without the regulatory sequence, the gene would be expressed in the wrong tissues.
B) Without the regulatory sequence, the gene would never be expressed.
C) Without the regulatory sequence, the wrong gene would be expressed.
D) With the regulatory sequence, the gene will be expressed in all tissues.
E) With the regulatory sequence, the gene can be permanently turned off.