Multi-choice problem: Continue writing the next sentence in this paragraph:

How to write a letter of interest for grad school
Set your intentions.
You should know what you want to achieve by attending graduate school before you start to apply. This statement is part of your application but it is also an opportunity for you to do some serious self-evaluation about your goals and plans.

(a). While you may not know your exact dissertation topic at this point, you should have a good idea of where you'd like to go in your studies. Evaluate your goals based on what you would like to study, and think about whether your particular focus will contribute to the field you're entering.. (b). You need to be aware that grad school can be taxing and difficult on your career. Think about getting into graduate school with a degree and then look through your ideas carefully after you have spent some time contemplating them.. (c). This should come into play once you graduate. Acknowledge all the internships you may need to complete.. (d). Having a clear understanding of your reasons for wanting to graduate will help you get a better idea of what you want to accomplish. What are you trying to achieve in graduate school? What do you want to gain? Learn about both of these before you begin writing your intent letter..
(a).