Read the following message, and answer the following questions.

Dear Mr. Sanchez:
Your efforts to promote ethical business practices in our city have drawn national recognition. You are an excellent role model for all our citizens, especially our youth.
Following your leadership, next month Jackson High School, in partnership with the Decatur Chamber of Commerce, will be hosting our second annual Ethics and Leadership for Youth conference. Last year the ELY conference had more than 1,500 attendees from district high schools. This year we are increasing our registration to accommodate 750 more students from neighboring school districts. We are excited that so many students are interested in promoting ethics and leadership in their community.
Last year, after learning about the importance of ethical leadership, students who attended our conference returned to their home schools and implemented a total of nine ethics and leadership initiatives. One of these initiatives included a project in which students researched ethical leaders in the local community. Naturally, the students encountered much of your work and have humbly requested your presence at the Ethics and Leadership for Youth conference this year. As a speaker at the ELY conference, you would have the opportunity to significantly impact our next generation of leaders.

[CLOSING]

Sincerely,
Jan Sanduccino, Principal
Jackson High School

Which of the following paragraphs most effectively completes the [CLOSING] section of this message?

a) Therefore, we would like to invite you to be the keynote speaker for the second annual ELY conference. If you are able to join us, please call me before the middle of this month.
b) Therefore, we would like to invite you to be the keynote speaker for the second annual ELY conference. The keynote address is scheduled for 10 a. m., Friday, April 16, in the Jackson High Memorial Auditorium. Our students would be honored by your presence. If you are able to join us, please call me at (555) 673-3333 by March 15 to make arrangements.