An amino acid has one proton donating group in the side chain. The pK,, pk, and pKp values for this amino acid are 2.19, 9.67 and 4.25, respectively. Which one of the following statements about this amino acid is correct? a. Majority of the molecules will have a net charge of -1 at pH of 7.0. b. Majority of the molecules will have a net charge of 0 at pH of 4.25. C. All the molecules will have a deprotonated R group at pH of 3.22. [IIT-JAM] d. During titration with a strong base, deprotonation will start with the R group.