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Answer:
A is the correct answer
Explanation:
Marcellus thinks Horatio should speak to the ghost because he will know what to say to him. He is a scholar and is educated. He is also a great friend of Hamlet.
The correct answer is A.
The ideas in this sentence are not coordinated at all. They are merely two sentences linked by the conjunction "and."
In order to coordinate it correctly, a more appropiate conjunction should be added. One possibility would be the word "also."