'Ambiguous' means unclear or open to multiple interpretations, fitting the context of uncertain taxation policy. 'Ambivalent' means having mixed feelings.

'Decisions' is plural, so the verb should be 'affect' not 'affects'. The subject-verb agreement is incorrect.

'Renowned' is the correct adjective meaning famous or well-known. 'Renown' is a noun and doesn't fit grammatically in this position.

'Indicators' is plural and requires the plural verb 'show', not 'shows'. Subject-verb agreement error.

After 'has' we use past participle 'implemented'. To maintain parallel structure with the second verb, we use 'promote' in infinitive form after 'and'.

'Despite' doesn't take 'of'. 'Match' is singular, so 'was' is correct. 'In spite of' would need 'of'. Option B is grammatically correct.

'Affect' (verb) means to influence. 'Effect' (noun) means result. In option B, 'affect' correctly means 'influence mood and productivity'.

With 'neither...nor', the verb agrees with the nearer subject. 'Employees' is plural, so 'are' is correct.

'Committee' is collective noun needing 'has' not 'have'. 'They' (plural) needs 'were' not 'was'. Both are errors.

'Findings' (plural) takes 'contradict'. 'Are necessary' is grammatically correct parallel structure. The logic fits the sentence context.