David and Rachel are getting married. The extended family wants to have its picture taken, but David's father is unwilling to stand next to Rachel's mother. How many options does the photographer have to arrange the 10 family members in a row for the picture?	Pick:
A) 9!  B) 9×8!  C) 8×9!  D) 10!/2!  E) 10!
Total - Restriction =   = 10! - 9!*2! =   = 9!(10 - 2!) =   = 8*9!.   Answer: 8×9!
<result>C</result>
David and Rachel are getting married. The extended family wants to have its picture taken, but David's father is unwilling to stand next to Rachel's mother. How many options does the photographer have to arrange the 10 family members in a row for the picture?