The correct answer is Option B: A, B, C and E only.

Let's break down why:

Connective Tissues that Secrete Collagen or Elastin:

• Cartilage (A): Cartilage cells, called chondrocytes, produce a matrix rich in collagen fibers, providing its structure and flexibility. Some types of cartilage also contain elastin fibers for added elasticity.
• Bone (B): Bone cells, called osteoblasts, secrete a matrix containing collagen fibers, which provide tensile strength, and calcium phosphate crystals, which provide hardness.
• Adipose Tissue (C): While primarily composed of fat cells (adipocytes), adipose tissue also contains a network of collagen fibers that provide structural support and help maintain the tissue's shape.
• Areolar Tissue (E): Areolar tissue is a loose connective tissue with a rich network of collagen and elastin fibers. These fibers provide support, elasticity, and allow for the passage of blood vessels and nerves.

Blood (D): Blood is a fluid connective tissue. While it has proteins, it doesn't directly secrete collagen or elastin fibers. Its primary components are plasma, red blood cells, white blood cells, and platelets.

Therefore, the connective tissues that secrete collagen or elastin are cartilage, bone, adipose tissue, and areolar tissue, making Option B the correct answer.