a)The effects of the Winter Promotion Event on the 2007 Sales Performance.
b)The effects of the Winter Promotion Event on 2007 Sales Performance.
c)The effects of the Winter Promotion Event on Sales Performance in 2007.
d)The effects of the Winter Promotion Event on Sales Performance 2007.
Let me know, I am confused now.
更新1:
This is a subject of a memo, therefore has no verb.