It's going from a root to something else, so it would be a carrot, because a carrot is a root. just like potatoes, beets, and other vegetables of the like.
Poaceae or Gramineae is a large and nearly ubiquitous family of monocotyledonous flowering plants known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns and pasture. The latter are commonly referred to collectively as grass.
The correct answer is: [C]:
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" {I heard Charlie say that he was "head over heels in love."} " .
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If you put each of the possible answers in the blank and read the sentence the right answer would be C.