What the argument says ?
2 new employees have a) Salaries which are very high for simple tasks assigned to new employees
b) They have been given duties which are normally meant for experienced people.
Based on which he says their salaries and complexity of the tasks should both be reduced , what Barnes assumes is that the new employees are newbies and not experienced people . Example : If i have recently shifted a job to a new company i will be a new employee there but i do have past experience which deems me to get complex tasks and a higher salary .
Coming back to the choices
(A) The duties of the two newest employees are not less complex than any others in the company. Explanation : Not relevant since other companies are not taken into account
(B) It is because of the complex duties assigned that the two newest employees are being paid more than is usually paid to newly hired employees.
Even if this is assumed it does not help to bridge the gap of the conclusion i.e reduction in their salary
(C) The two newest employees are not experienced at their occupations.
Clearly nails the answer choice . (D) Barnes was not hired at a higher-than-average starting salary.
We are not concerned about Barnes (E) The salaries of the two newest employees are no higher than the salaries that other companies pay for workers with a similar level of experience.
We are not considering other companies here Answer is C