Read the paragraph. Read and complete the sentence with the correct part.
When a person sleeps, their brain maintains proper blood sugar levels and regulates hormones that control appetite and metabolism. It also reduces high blood pressure. A good night's sleep leads to better physical, mental, and emotional health. Without enough sleep, a person may feel cranky and tired, have a short temper, and be unable to think clearly. This can lead to arguments with parents or friends and various mental issues, making it more difficult to concentrate and remember things.
If people don't get enough sleep,...

• they cannot argue with parents or friends.
• they cannot concentrate well.
• they do different things very well.
• they can struggle with any difficulty.