问道语法题

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Nicknamed the supergrain of the future, quinoa is a complete protein, one that contains all the necessary amino acids and is high in fiber.
( n  D2 C3 j4 j# c  gA. protein, one that contains all the necessary amino acids and is
B. protein, it contains all the necessary amino acids and is
C. protein, and containing all the necessary amino acids in addition to being
  [+ Q; ]7 d; i2 DD. protein that contained all the necessary amino acids and also is
7 k! H$ k3 P9 _; T/ h( f+ {8 ^E. protein; thus , containing all the necessary amino acids and being also
$ V. Z; P' e+ j# O7 C& ^
% U/ b* U% r/ }答案是A， 但A中的and连接的部分好像前后不一致，请教一下！