'Fragmented' fits the context that different nations have different approaches, suggesting lack of unified regulation.

The passage's core message is that the brain can be rewired through deliberate practice, contradicting fixed neural structures.

'Number' (singular noun) requires 'has' instead of 'have'.

A introduces the topic, D provides specific example, B explains the mechanisms, C discusses implications in order of logical flow.

The passage demonstrates that cities with infrastructure investments show improvements, implying public transport investment is a viable solution.

'Diversity' is singular, requiring 'has' instead of 'have'. The subject-verb agreement error is the primary issue.

'disrupted' accurately describes the gig economy's impact, and 'limiting' correctly modifies the lack of traditional employment benefits.

'Who' is used for people, while 'which' is for things. Since it refers to 'professionals,' 'who' is correct.

The passage contrasts successful awareness efforts with unequal access, highlighting that awareness alone doesn't ensure treatment accessibility.

C introduces ML adoption, A explains technical requirements, B specifies data quality importance, D illustrates consequences of poor practices.