Need help ASAP please 7) Which of the following best describes protein shape?

A) Proteins are immediately folded into their 3-D shapes, and they denature completely after they complete their
functions.
B) Proteins hold their rigid 3-D shape even in unfavorable conditions, such as low pH or high temperatures.
C) Proteins can adopt many shapes, so the number of proteins produced is far less than previously assumed.
D) Proteins may fluctuate between inactive and active forms, where portions of the protein are disordered.