Identify Logical Connections between Sentences

Study the groups of sentences, identify the logic that connects the two groups and select the best transition. To review, see this discussion of logical connections and transitions (opens in a separate browser window).

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Pluto presents significant challenges for spacecraft because of its small mass and great distance from Earth.
Voyager 1 could have visited Pluto, but controllers opted instead for a close flyby of Saturn's moon Titan.