The automobile is powered by an internal____engine.
The automobile is powered by an internal combustion engine.
The automobile is powered by an internal combustion engine.
The automobile is powered by an internal combustion engine.
To arrive at this answer, we can break down the question into key components and look for relevant information.
1. Keyword: automobile
2. Key concept: powered by
3. Missing information: the specific type of engine
Understanding the concept of an automobile, we know that it requires an engine to propel itself. In this case, we're looking for a specific type of engine.
To determine the specific type, "internal" gives us a clue that the engine is contained within the automobile. By process of elimination, the most common type of engine used in automobiles is an internal combustion engine.
Therefore, based on this reasoning, we can confidently say that the automobile is powered by an internal combustion engine.