Men fought over gold more than a century ________.

• A. Ago
• B. Before
• C. Since
• D. During

Answer: (A)

Choosing a time expression that correctly places an event in the past is the key idea here. More than a century ago is a standard, natural way to say something happened over 100 years in the past relative to today. It matches the idea of a completed past event without tying it to a continuing situation.

The other options don’t fit the same sense. Before needs a reference point to connect with, and without one it sounds incomplete or odd. Since marks a starting point that continues up to now, which would change the meaning to something begun long ago and still relevant. During requires a specific period or duration to be defined, and without that context it doesn’t convey a clear past distance in the same way.