The correct answer is: A. doubtful.
The word “definite” means “certain or sure.” The word “doubtful” means “not certain or sure.” In this case, the question is asking whether or not it is certain that the person will come to the place tomorrow. There are a number of reasons why it might not be certain, such as if the person is sick, has a change of plans, or is unable to get to the place. Therefore, the correct answer is “doubtful.”
The word “regrettable” means “causing regret or disappointment.” In this case, the question is not asking whether or not it is regrettable that the person might not come to the place tomorrow. Therefore, this is not the correct answer.
The word “questionable” means “open to doubt or question.” In this case, the question is not
asking whether or not it is questionable whether or not the person will come to the place tomorrow. Therefore, this is not the correct answer.The word “unpredictable” means “not able to be predicted.” In this case, the question is not asking whether or not it is unpredictable whether or not the person will come to the place tomorrow. Therefore, this is not the correct answer.