Read the conclusion.

you for your attention. as i have mentioned many times, i believe ms. sanchez deserves to be our school’s teacher of the year for 2013. her dedication to the tutoring program, her accessibility, and her professionalism set her apart. we have a staff full of devoted academics, but ms. sanchez is the best of the best.

how can the writer best strengthen the conclusion?

by summarizing key points
by restating the claim
by telling a related joke
by issuing a call to action

The correct answer is "by issuing a call to action". Introductions and conclusions can be difficult to write, but they’re worth investing time in. They can have a significant influence on a reader’s experience of your paper. Your conclusion is your chance to have the last word on the subject. By synthesizing your thoughts, demonstrating the importance of your ideas and by issuing a call to action, give you the opportunity to make a good final impression and to end on a positive note.

D. by issuing a call to action

what can i you with?

assuming the underlined word is "regnant", the correct answer is b) ruling.