题目内容：
根据短文内容，回答题。When it comes to human resources，hiring highly skilled staff is not usually enough for a company to function successfully．Besides the knowledge in their particular fields，employees must always have additional skills-those of cooperation．In the case that work tasks can only be carried out by communicating with people，accepting common decisions，solving problems，sharing information and helping one another，teamwork skills are vital．
While some jobs may require talent，the ability to work as a team is learned．There are no complicated formulas；you don’t need to have any special qualities or exceptional mental abilities．
Individuals can be effective as a team if they have developed certain behaviors or habits of communication．Many companies，clubs and organizations use team building activities．Team building activities may include a number of teamwork elements．They are aimed at encouraging active participation in task accomplishment while all members have their roles as individuals and are able to cooperate towards a common goal as a team．
Many team building activities focus on problem solving and discussing team issues；thus argument as a way to common consensus(共识)is encouraged．Team building activities often involve recognition and identification of team member skills，talents，knowledge，and experiences which allow the team members to learn more about each other and fully utilize those skills where appropriate．Many team activities are focused on developing keys to trust during challenging times.
In the author’s opinion．which of the following is vital for a company to be successful? A．Specialized knowledge．
B．Highly skilled staff．
C．Exceptional talent．
D．Teamwork skills．
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