Step 1: Understanding the Question.
The six sentences give advice on staying motivated at work, moving from things you can do alone to things you can do with your team. We need to find the order in which the ideas build on each other logically.
Step 2: Key Approach.
Look at the linking words at the start of each sentence, especially "Or", which signals another option in a list that has already started, and "Presumably", which signals a shift from talking about yourself to talking about your team.
Step 3: Detailed Explanation.
Sentence 5, "Find ways to motivate yourself", is the general opening instruction that the rest of the sentences give examples of.
Sentence 3, "Work towards targets of your own, or promise yourself a reward for certain achievements", gives the first concrete way to do this, still focused on the individual.
Sentence 6 starts with "Or simply make a point of congratulating each other on good work", continuing the same list of individual-level ideas that sentence 3 started, offering another option with "Or".
Sentence 2 then shifts the focus outward: "Presumably your team members have the same problem, so perhaps you could find collective incentives", moving from personal methods to team methods.
Sentence 1 follows naturally, giving concrete examples of these collective incentives: friendly competition, or shared tea targets with a reward of going out together.
Sentence 4 closes the paragraph with one more option, still linked by "Or": aiming for promotion or new responsibilities as an incentive.
This gives the order 5-3-6-2-1-4, which is option 4.
Step 4: Final Answer.
The correctly arranged paragraph reads 5-3-6-2-1-4, so the answer is option 4.