To determine the correct answer, we need to analyze the given options and choose the one that fits the sentence correctly. Let's break down the options and explain each one:
Option A:
Carelessly
- The word "carelessly" is an adverb that describes how someone drives.
- This option is grammatically correct and fits the sentence structure.
Option B:
More careless
- The phrase "more careless" is a comparative form of the adjective "careless."
- However, the sentence does not indicate a comparison between the neighbor's driving and someone/something else.
- Therefore, this option does not fit the sentence correctly.
Option C:
Most careless
- The phrase "most careless" is the superlative form of the adjective "careless."
- Again, the sentence does not imply a comparison between the neighbor's driving and others.
- Thus, this option is not suitable for the given sentence.
Option D:
Careless
- The word "careless" is an adjective that describes the neighbor's driving.
- This option is grammatically correct, but it does not match the sentence structure as it lacks the adverb form required.
Based on the analysis, the correct answer is option A:
Carelessly.