Analyze each option:
- Option 1: Bone, blood, and skin. Skin is not a connective tissue; it is primarily composed of epithelial tissue.
- Option 2: Red blood cells and neurons. Neurons are part of the nervous system, not connective tissue.
- Option 3: Cartilage, bone, and epithelium. Epithelium is not a connective tissue; it forms the lining of surfaces and cavities.
- Option 4: Adipose tissue, dense and loose connective tissues, and neurons. Neurons are not connective tissue.