The correct answer is C. Eventually
Explanation:
An appropriate transition should always show the relationship between two sentences or two grammatical elements. In the case of the sentence "The Tennessee Valley Authority erected 20 dams, ________ providing much-needed jobs for up to 40,000 workers" it is suggested the jobs given to 40,000 workers were the result or consequence to the construction of 20 dams.
According to this, it is necessary to include a consequence transition such as therefore, thus or eventually. This means in this case the best option is "eventually" because this is the only transition that shows the consequence relationship between the two sentences; while the transition "because of" is used to show cause, "despite" is used to show contrast and "in addition" is used to add information.
