Which of these diagrams best represents the steps in the formation of the solar system? The picture shows a flow chart with four rectangular boxes. There is an arrow pointing downwards between the first and second boxes. There are two arrows pointing downwards below the second box. One of the arrows below the second box points towards a box below it which is placed on the left. The other arrow below the second box points towards a box below it which is placed on the right. The label within the topmost rectangle is 'Rotation of clouds of gas and dust'. The label within the second box is 'Condensation of the clouds to form an elliptical disc'. The label within the left hand box below the second box is 'Particles in the center combine'. The label within the right hand box below the second box is 'Planets form in the disc'.

The picture shows a flow chart with four rectangular boxes. There is an arrow pointing downwards between the first and second boxes. There are two arrows pointing downwards below the second box. One of the arrows below the second box points towards a box below it which is placed on the left. The other arrow below the second box points towards a box below it which is placed on the right. The label within the topmost rectangle is 'Rotation of clouds of gas to form nebula'. The label within the second box is 'Condensation of the clouds to form the Sun'. The label within the left hand box below the second box is 'Solar winds blow'. The label within the right hand box below the second box is 'Fusion of gases to form planets'.

The picture shows a flow chart with four rectangular boxes. There is an arrow pointing downwards between the first and second box, second and third box, and third and fourth box. The label within the first box is 'Rotation of clouds of gases and dust'. The label within the second box is 'Condensation of the clouds'. The label within the third box is 'Formation of the planets'. The label within the fourth box is 'Combining of the gases to form the center of the system'.

The picture shows a flow chart with four rectangular boxes. There is an arrow pointing downwards between the first and second box, second and third box, and, third and fourth box. The label within the first box is 'Rotation of clouds and gases'. The label within the second box is 'Formation of the planets'. The label within the third box is 'Combining of the gases to form the center of the system'. The label within the fourth box is 'Flattening of the nebula'.