39. The t-butoxycarbonyl group (Boc) is a widely used protecting group for primary amine and secondary amine. What reagent is commonly used for deprotection of N-Boc group in the Merrifield solid phase peptide synthesis?
(A) OH-
(B) Pd/C, H2
(C) Pd(OH)2/C, H2
(D) Acetic acid
(E) CF3COOH