Throughout history, people have searched for gold. ________ this precious metal has not always been...

• A. However
• B. But
• C. Yet
• D. Although

Answer: (B)

The main idea here is using a contrastive connector to link two statements about gold. After saying people have searched for gold, we need a word that shows a different, opposite reality about gold’s status. This is best done with a simple coordinating contrast: But this precious metal has not always been...

But is the most natural choice because it directly joins two independent sentences and signals contrast in a straightforward, everyday way. Although would require the second part to be a complete clause after it, which isn’t provided here. Although this sentence could start with a clause, it would leave the thought incomplete. Yet could also work, but it sounds more literary or formal in some contexts. However would be correct too, but in this plain two-sentence structure, But fits most smoothly and keeps the style simple and conversational.