The correct answer is A. thoughtful.
A contemplative person is someone who is given to thought and reflection. They are often quiet and introspective, and they enjoy spending time alone to think about their thoughts and feelings. They may also be interested in philosophy, religion, or other topics that require deep thought.
The other options are incorrect because they do not accurately describe a contemplative person.
- A careless person is someone who does not pay attention to detail or who is not careful in their actions.
- An over-zealous person is someone who is too enthusiastic or eager, and who may act without thinking.
- A mischievous person is someone who enjoys playing pranks or causing trouble.
It is important to note that these are just general descriptions, and that there may be exceptions to the rule. For example, a person who is generally thoughtful may sometimes act carelessly, and a person who is generally mischievous may sometimes act thoughtfully.