Read the following response to a party invitation:
"Hi Mark,
Thanks for inviting me to your barbecue. I really appreciate it! I'm so sorry, but I won't be able to join you. My aunt is visiting from out of town that weekend, and we're planning a family dinner to welcome her. I hope you have a great time, and I'll catch you next time!
Best,
Jessica"
Which part of Jessica's letter provides the *reason* for her not attending the barbecue?
A) "Thanks for inviting me to your barbecue. I really appreciate it!"
B) "I'm so sorry, but I won't be able to join you."
C) "My aunt is visiting from out of town that weekend, and we're planning a family dinner to welcome her."
D) "I hope you have a great time, and I'll catch you next time!"