Propitious means favorable or auspicious. Option B is the correct synonym.

The infinitive structure is incorrect. After 'should,' use 'be' directly, not 'to be.' Correct form: 'should be extended.'

Logical flow: Problem statement (A) → Specific example (B) → Response (C) → Conclusion (D).

C introduces the main topic, A explains the process, B shows the result, and D concludes with the ultimate benefit. This creates a logical progression.

'demonstrated' fits the context of showing potential, and 'surpass' correctly indicates exceeding classical computers in capability.

The passage mentions a target of 500 GW renewable capacity but never states that it will completely replace fossil fuels. This inference is not supported.

When 'neither...nor' connects subjects, the verb agrees with the nearest subject. 'Employees' (plural) is nearest, requiring 'have' instead of 'has.'

C introduces the transformation, A explains the contributing factors, B provides specific examples, and D concludes with the outcomes.

The passage discusses escalating threats, investment in defenses, and human vulnerability, collectively suggesting the need for comprehensive security approaches.

Parallel structure requires both infinitives or gerunds. 'aims at improving' should be paired with 'ensuring' (both gerunds).