medium · SAT Reading & Writing

The chief drawback of the lithium-ion cell is that its liquid electrolyte degrades after several hundred charge cycles, steadily shrinking the capacity a driver can rely on. ______ researchers have begun testing solid-state electrolytes, which resist that breakdown and may extend a pack's usable life by years. Which choice completes the text with the most logical transition?

1. To address this,
2. In contrast,
3. Furthermore,
4. Specifically,

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