In an example of cell-to-cell communication involving the substance TSH from the Pituitary Gland, which is the order of communication? (A) Pituitary: TSH  ducts  Thyroid Gland cell marker proteins  cell  Thyroxin  blood (B) Pituitary: TSH blood  Thyroid Gland cell receptor proteins  cell  Thyroxin  body (C) Pituitary: Thyroxin  blood  Thyroid cell channel-forming protein  cell TSH  body (D) Pituitary: TSH  Thyroid cell carrier molecule  channel  cell  Thyroxin body