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During an experiment, an acid (vinegar) was added at the same rate to two different liquids. Liquid A was distilled water; Liquid B was distilled water with a crushed antacid tablet stirred in. Which liquid became acidic first, as indicated by a change of litmus paper from blue to red?

A. Liquid A became acidic first.

B. Liquid B became acidic first.

C. They changed at the same rate.

D. Neither of them ever became acidic.