'Majority' is a plural noun here (majority of respondents), requiring the plural verb 'prefer'.

The context shows the researcher's conclusions are credible, meaning her hypothesis was confirmed/validated by data, not challenged.

With 'either...or', the verb agrees with the nearer noun. 'Assistant' is singular, so 'is' is correct: 'either...or is'.

Singular subject 'phenomenon' requires 'has' not 'have'. Youth is the plural form, so 'youths' is also incorrect, but the primary error is verb agreement.

Decipherment means the act of decoding or interpreting something difficult to read. It's most appropriate for an ancient manuscript.

The logical sequence is: The government launched an initiative (P) to promote sustainable development (Q) in rural areas (R) with significant budget allocation (S).

Singular subject 'research' requires singular verb 'has garnered'. The active voice is appropriate here.

'Each' is singular, requiring 'is' not 'are'. Modern usage accepts 'their' as a singular pronoun.

Propensity means a natural tendency or inclination. It fits the context of the CEO's inclination toward innovation.

When 'along with' is used, the main subject remains singular. The manager (singular) requires 'is planning'.