The most important safety rule to follow in the laboratory is to always follow directions.
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Answer: The correct option is 
Explanation:
According to the Bronsted Lowry conjugate acid-base pair, an acid is a substance that donates protons and a base is a substance that accepts protons.
From the given options,
represents a Brønsted Lowry base as it is accepting
and
represents a Brønsted Lowry acid as it is donating
.
Temperature. Also, you should put more detail into your question, as it's not entirely clear what your asking.