When you are meeting your coworkers. Normally, HR manager or head of office will introduce and welcome you. Which of the following introduction speech is not appropriate?
选项：

A:Luckily the weather has aligned with our wishes. The sun and I bid you a warm welcome.;
B:It's my pleasure to extend a cheerful welcome to you all!;
C:Hello, how are you doing today？;
D:On behalf of my colleagues, I wish you all a convivial welcome.