Explanation:

- The sentence discusses a part of philosophy related to life's meaning, emphasizing how people understand and think about this topic.

- Option 1: attempt - Properly spelt. It refers to a try or effort to do something.

- Option 2: philosophy - Correctly spelt. It means the study of fundamental nature of knowledge, reality, and existence.

- Option 3: think - Appropriately spelt. It implies the process of using one’s mind to consider or reason about something.

- Option 4: systemetic - Incorrect spelling. The correct spelling is "systematic," referring to a methodical approach or done according to a plan.