Step 1: Think about what would happen without a tilt.
Imagine Earth's axis stood straight up. The Sun would always shine over the equator. Every place would keep the same day length all year, and there would be no seasons.
Step 2: Add the tilt.
The real axis leans by 23.5 degrees and keeps pointing in the same direction in space. When the northern half leans towards the Sun, it gets longer days and more direct rays, so it is summer there.
Step 3: Add the revolution.
Six months later Earth is on the other side of its orbit. Now the southern half leans towards the Sun, and the northern half has winter. The change needs movement around the Sun.
Step 4: Rule out the other choices.
Rotation only gives day and night. The Moon's gravity gives tides. Revolution without a tilt gives no change. Only the tilt with revolution explains seasons.
Final Answer:
Seasons come from the tilted axis while Earth moves around the Sun, so the answer is option 4.
\[ \boxed{\text{Option 4}} \]