In B, why will one use a present tense for one activity and present perfect for the second act when both happen simultaneously? These are inherent habits and therefore have to be expressed with present tense. Secondly, both activates are not equal functions. Eating is the primary action and augmenting is an auxiliary action. The supplementary action has to be always presented in a subordinate clause or in a modifier. Therefore, B is stylistically inferior in the context.
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