Concept:The daily rising of the sun is described with the fixed expression “in the east.”Explanation:Standard English uses the preposition “in” with directions such as the east, west, north, and south. For example, we say: “The sun rises in the east and sets in the west.” Though “from” can show the starting point of a journey or motion, it is not the natural preposition used with “rise” when speaking about the sun’s position in the sky. Therefore, the correct completion of the sentence is: “The sun constantly rises in the east.”Answer:A. in