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