Directions: Arrange the sentences A, B, C and D to form a logical sequence between sentences 1 and 6.

1. According to Einstein, gravitation is an inherent property of space-time. A. Now the path of a ray of light must be just as obedient to the laws of geometry as is any other path. B. The planets, for instance, move in the way they do because they are pursuing the easiest path through the space-time continuum that surrounds them. C. Accordingly a ray of light passing through what we call a gravitational field must follow the path appropriate to that field. D. It is not that they are acted on by a force; the path they follow is the natural 'straight line' path in a region governed by that particular kind of non-Euclidean geometry.
2. This means, in practice, that a ray of light from a distant star, passing near the sun will be deflected, and the star will appear displaced in the sky.