When Considering Fibrous Proteins,which of the Following Statements Is TRUE $\alpha$

Multiple Choice

When considering fibrous proteins,which of the following statements is TRUE?

A) Noncovalent interactions contribute to the strength of all of these proteins.
B) All of them consist of $\alpha$ helix structure.
C) All of them require vitamin C.
D) Decrease in amounts of any of them cause scurvy.
E) All of these are true of fibrous proteins.