This is a common decision point on Data Sufficiency questions. However, many students proceed by hunch or guess because it seems correct.
The best advice I can give is to keep in mind that the GMAT test writers are frequently trying to trap you, so typically you'll be left with a more tempting "trap" answer and a less tempting correct answer. Like George Costanza in the famous fifth season finale of Seinfeld, sometimes it's better to do the opposite of what you're feeling.
If you can narrow down the answer for legitimate reasons, pick the answer that must be true. If you're stuck between two choices, and one tempts you more but you're not sure why, it's often better to ask yourself why it's tempting you, and then go with the opposite if you don't have a legitimate reason. Who knows, you might even end up getting a job with the New York Yankees.
Hope this helps
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