Step 1: Analyze the sentence structure.
The sentence contains a list of actions supported by unemployment benefits, followed by a final action that contrasts with the others. The conjunction "but also" should be used properly after the list.
Step 2: Analysis of options.
- (A) Unemployment benefits in the United States did not only support recession struck individuals, create opportunities for volunteerism, and had covered their expenses, but also: "Had covered" is an incorrect tense usage. It should be "cover" to maintain parallel structure.
- (B) Unemployment benefits in the United States not only supported recession struck individuals, created opportunities for volunteerism, and covered the expenses of the unemployed, but also: This option maintains parallel structure correctly but changes the meaning by suggesting a different phrasing ("not only... but also").
- (C) Unemployment benefits in the United States did not only support recession struck individuals, create opportunities for volunteerism, and cover the expenses of the unemployed, but also: Correct. This option uses the correct parallel structure and maintains clarity.
- (D) Unemployment benefits in the United States supported not only recession struck individuals, create opportunities for volunteerism, and cover their expenses, but also they: The structure is awkward and lacks clarity in phrasing.
- (E) Unemployment benefits in the United States did not only support recession struck individuals, create opportunities for volunteerism, and cover their expenses, at the same time: "At the same time" is unnecessary and disrupts the flow.
Step 3: Conclusion.
The correct answer is (C), as it uses the appropriate parallel structure and clear expression.