Receptionist：Good morning.Can I help you？
Student：Yes，please.I’d like to have some information about the course at Swan School.
Receptionist：（5[B]）Is that a summer course you are interested in？We have a short intensive full time course in summer.
Student：Oh？Yes，I’d like to know the length of one course.
Receptionist：Each course lasts for 3weeks.And it is about 23hours per week.Usually four and a half days a week.
Student：Ok.You must have lots of students in the class？
Receptionist：We have lots of students in the school，but in the classes only about 12and 14students.
Students：12and 14.Could you give me the dates of the first and second courses？
Receptionist：Certainly.The first course begins on July 3and lasts until July 20and （7[C]）the second is from July 24to August 10.
Students：What about the fees per course？
Receptionist：Each costs $150plus tax，which is 15%，and a $5registration fee.
Students：Thank you.Do we have to find our accommodation？
Receptionist：We can do that for you.We have a lady who arranges it for you with college families.
Students：How much does it cost？
Receptionist：Well，you can Choose to have bed and breakfast only，which is $20per week，（6[B]）or bed，breakfast and dinner which is about $27a week.
Students：$27a week.Thanks very much.
Receptionist：You are welcome.

What course is the student interested in?（）

A．A two-month course.
B．A course that lasts for the summer.
C．A course of 23 weeks.
D．A course of four and a half weeks.