The correct sentence structure in English is Subject-Verb-Adverb-Object. The subject (the deer) should be followed by the verb (ran), then the adverb (swiftly), and finally, the object (through the forest). The correct option (a) follows this structure.

The correct sentence structure in English is Subject-Verb-Object. The subject (we) should come first, followed by the verb (saw), and then the object (the movie). The correct option (a) follows this structure.