Answer :
The phrase “went over” most likely means died. Thus the correct answer is C.
What is a phrase?
A phrase refers to the structure of a sentence that provides the complete meaning of the thought written with a group of words.
In the line "For a long time, she held her neck erect; then her head sank, slowly. Her ribs swelled with a mighty heave and she went over" the word means died as she suffered with pain.
Therefore, option C is appropriate.
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