GMAT Sentence Correction
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Source: PREP
Level: 3
Thunderclouds form when warm, moist air rises into cooler air above, because either the ground is warmer than usually or because the interaction of two air masses, one warm and one cold, forces warm air to rise.
- A because either the ground is warmer than usually or because
- B because either the ground is warmer than usual or because of
- C because of either the ground being warmer than usual or because
- D either because of the ground's being warmer than usually or because of
- E either because the ground is warmer than usual or because