Explanation:

The correct answer to the given question is option 'D', which states that "Most of the candidates pass this exam." Let's understand why this is the correct answer.

Understanding the question:
The question states that there are candidates taking an exam, and we need to determine the correct statement about the number of candidates who pass the exam.

Analysis of options:
a) Enough: This option does not provide any information about the number of candidates who pass the exam. It does not give a specific number or percentage.
b) Fewer: This option suggests that the number of candidates who pass the exam is less than some other group. However, there is no comparison given in the question, so we cannot determine if this statement is true or false.
c) Either: This option suggests that the number of candidates who pass the exam could be either more or less. But since the question asks for a definitive answer, this option cannot be correct.
d) Most: This option states that the majority of the candidates pass the exam. This means that more than 50% of the candidates are successful. Since this statement provides a specific condition for passing the exam, it can be considered as the correct answer.

Conclusion:
Based on the analysis of the options and the given question, the correct statement is that most of the candidates pass this exam. This implies that a majority of the candidates are successful in the exam.