The correct answer is C. Help them complete their work.
Explanation
Collaborative work is a type of work that is based on the achievement of a common goal through group or individual work. In general, when common goals are set in a company, each of its employees must be part of a network of functions that must work harmoniously to achieve those objectives. According to the above, if Sydney has already completed his obligations and his colleagues have problems completing theirs, he must help them because collaboration is a way of contributing to achieving the objectives set and that the operation of the company is harmonious and efficient. Therefore, the correct answer is C.