1.
Your Answer is
Correct Answer is B
Explanation
Item A/C: According to the meaning of the sentence, "it slides through the forest like a snake and winds beside the river embankment." Curving and bending along the banks of the river is a sentence adverbial, separated from the main body of the sentence by a comma, A /C error.
Item D: Because the curving and bending are parallel structures, there is no comma in the middle, and D is wrong.