Both hormones and neurotransmitters are signaling molecules. Which statement below gives a key difference between hormones and neurotransmitters?

• A. Hormones move through synaptic vesicles to be released.
• B. Neurotransmitters are steroids, while hormones are only peptides.
• C. Unlike neurotransmitters, hormones travel through the bloodstream to reach their target cells.
• D. There are only 2 neurotransmitters while there are many hormones.