In each of the following sets, arrange the three compounds in order of increasing reactivity toward base-promoted hydrolysis, least reactive first, and explain your reasoning.

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(a) nofo H₂C-C-OCH₂CH3 EtO-P-O- A 0- B (b) EtO-P-O-P-OEt ỎEt A OEt O Me₂N-P-NMe₂ NMe₂ C O EtO-P-OEt 0- с EtO-P-OEt OEt B CI-P-CI CI D