Annual DinnerStaff: freeGuests: ￡15 （max. 1 guest per employee)Limited place available －－

Annual DinnerStaff: freeGuests: ￡15 (max. 1 guest per employee)Limited place available -- BOOK NOW!Staff who wish to attend the dinner ______ .

A．are allowed to invite only one person each.

B．must book today if they want to invite a friend.

C．have to pay ￡15 each for themselves and their partner.

请帮忙给出正确答案和分析，谢谢！