What is the primary component of the plant cell wall,cellulose,made of?

• A
  Unbranched chain of glucose molecules linked by $\alpha-1, 4$ glycosidic bonds.
• B
  Branched chain of glucose molecules linked by $\beta-1, 4$ glycosidic bonds and $\alpha-1, 6$ glycosidic bonds at branching points.
• C
  Unbranched chain of glucose molecules linked by $\beta-1, 4$ glycosidic bonds.
• D
  Branched chain of glucose molecules linked by $\alpha-1, 6$ glycosidic bonds.