Please choose the correct answer to the question: Which of the following statements best explains why the tilt of Earth on its axis causes summer to be warmer than winter in the Northern Hemisphere?

Answer1: The warm ocean currents flow from the tropics to the Northern Hemisphere in the summer. Answer2: The rays of the Sun strike the Northern Hemisphere more directly in the summer. Answer3: The greenhouse effect increases in the Northern Hemisphere in the summer. Answer4: The Northern Hemisphere is closer to the Sun in the summer.

Answer format: answer1/answer2/answer3/answer4