English grammar error-spotting (complex sentence with ‘‘either … or …’’ and parallelism): Read the sentence divided into four parts (A–D) and identify the part containing any grammatical error. If there is no error, choose ‘‘No error.’’ Focus on coordination, pronoun reference, and clarity: ‘‘Since it was his first election campaign, the candidate was confused; / none could clearly understand / either the principles he stood for or the benefits he promised. / No error.’’

Given data

• A: ‘‘Since it was his first election campaign, the candidate was confused;’’
• B: ‘‘none could clearly understand’’
• C: ‘‘either the principles he stood for or the benefits he promised.’’
• D: ‘‘No error.’’

Concept / Approach
Check clause linkage (‘‘Since …’’), subject–verb agreement, and the correlative conjunction ‘‘either … or …’’ for parallel noun phrases. All three parts A–C are grammatically sound and idiomatic.

Step-by-step verification
Step 1: Part A correctly sets a causal background with ‘‘Since …’’; semicolon is acceptable (punctuation is to be ignored).Step 2: Part B uses ‘‘none’’ as a singular/collective pronoun with past ‘‘could’’—acceptable and idiomatic.Step 3: Part C maintains parallel structure: ‘‘the principles …’’ (noun phrase) // ‘‘the benefits …’’ (noun phrase), both governed by ‘‘either … or …’’

Common pitfalls

• Mistaking style issues for grammatical errors.

Final Answer
No error.