Final answer:
The correct sentence is 'I'm very tired and ready to go to bed.'
Step-by-step explanation:
The correct sentence is: I'm very tired and ready to go to bed.
In this sentence, the coordinating conjunction 'and' is used to connect two independent clauses ('I'm very tired' and 'ready to go to bed'). The commas (, ) in option A and option C are incorrect because they create a comma splice, which is when two independent clauses are joined by a comma without a coordinating conjunction. Option B uses a semicolon (;) which is not necessary because a coordinating conjunction is sufficient to join the two independent clauses. So, option D is the correct choice.
Learn more about Coordinating conjunctions