The correct answer is: B. Very hopeful of.
Sanjay is very hopeful of passing the Civil Services Examination this year. He has been preparing for the exam for a long time and he is confident that he has the skills and knowledge necessary to succeed. He is also motivated to do well, as he knows that a good score on the exam will open up many opportunities for him.
Option A is incorrect because it suggests that Sanjay is certain of passing the exam. While he is hopeful, he is not certain of success. There are many factors that could affect his performance on the exam, such as the difficulty of the questions and the competitiveness of the field.
Option C is incorrect because it suggests that Sanjay is lacking in self-confidence. While he may not be as confident as some other candidates, he is still hopeful of passing the exam. He has put in the hard work and he believes that he has a good chance of success.
Option D is incorrect because it suggests that Sanjay is only reasonably certain of passing the exam. While he is hopeful, he is not as confident as someone who is reasonably certain of success. He knows that there are many factors that could affect his performance on the exam, and he is not willing to take anything for granted.