<p>Throughout history, the search for salt has played an important role in society. Where it was scarce, salt was traded ounce for ounce with gold. Rome’s major highway was called the via salaria, that is the salt road. Along the road, Roman soldiers transported salt crystals from the salt flasts of ostia up the Tiber River. In return, they received a salarium. The old saying ‘worth their salt’ which mean to be valuable drivers from the custom of payment during the expire.</p><p> </p><p><strong>What does the passage mainly discuss?</strong></p>
Answer: B - salt
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