The correct answers for why Judea was strategically important to Rome are:
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the Parthian threat from the eastern side: Judea served as a buffer zone against Parthian incursions and conflicts.
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the great source of grain from Egypt: While Judea itself did not provide a significant grain source, it was part of the broader region that included Egypt, which was a vital grain-producing area for Rome.
The options regarding the olive oil from Macedonia and the threat from Spain are not relevant to Judea's strategic importance.