Karuna wrapped some green gram pulses in a wet cotton cloth. She opened it after a couple of days and found small, white thread like structures on the seeds. What change did the pulses undergo?

• A.  They have undergone a physical change.
• B.      They became fresh as usual by washing and drying.
• C.      They have undergone a chemical change.
• D.      They have undergone a reversible, physical change.