Which among the following is incorrect about cytoskeleton, cilia and flagella?

• A. Cytoskeleton is the network of minute proteinaceous structure in the cytoplasm and which mainly contains microfilaments and micro tubules
• B. Microtubules are composed of protein actin and microtubules are composed of protein tubulin
• C. Cilia is present in large numbers of the body and only one or two flagella are present in an organism
• D. Both flagella and cilia help in movement of the organism