Which of the following contributed LEAST to the decline of the Roman Empire?

Explanation: The Senate persisted throughout Roman history and beyond. Choices (A), (B), and (D) are all serious issues that the Romans encountered in the imperial period and all are arguably far worse than the existence of the Senate. Therefore, you can eliminate those three choices and choose (C).

Which of the following inferences is most supported by the discussion of copper and gold in the passage?

Explanation: The discussion of copper and gold is in the middle of the passage in which Mansa Musa claims that Mali sells copper for gold. Choices (A), (C), and (D) do not mention trade in any way, so they can be eliminated for this reason. Choice (B) is correct.

Based on the map and your knowledge of world history, which of the following likely accounts for the westernmost end of the cable in Egypt?

Explanation: The cable line ends in Egypt at a place labeled Suez. This obviously invokes the Suez Canal, so (B), (C), and (D) can be eliminated on the basis that they do not mention the canal. Choice (A) is correct.