Respuesta :
Answer: Answer choice A
Why: Process of elimination.
Not B, because that would be claiming that eating carrots THAT ARE rich in vitamin A, rather than saying carrots WHICH ARE rich in vitamin A.
Not C, As there is horrible flow in both of the sentences.
Lastly, not D, as the original text didn't day anything about how successful scientists have been in proving this, and to say that would be adding on extra information.
Answer:
B. Carrots are rich in vitamin A, and eating them improves eyesight. Scientists state that eating carrots helps people see clearly in the dark.
Explanation: