English grammar error-spotting (comparison marker ‘‘more’’ vs. intensifier ‘‘greatly’’; capitalization): Read the sentence in four parts and pick the erroneous one. Watch for inappropriate comparative ‘‘more influenced’’ without a ‘‘than’’-phrase and capitalization of discipline names: ‘‘It is an established fact that the transcendental American poets and philosophers. / who lived in the latter half of the nineteenth century. / were more influenced by Indian philosophy, in particular by Upanishadic Philosophy. / No error.’

Given data

• A: Background clause ending in a full stop (punctuation ignored).
• B: Relative clause with time reference.
• C: Predicate: ‘‘were more influenced by Indian philosophy, in particular by Upanishadic Philosophy.’’

Concept / Approach
Use a comparator only when comparison is explicit (‘‘more … than …’’). Without a ‘‘than’’-phrase, use an intensifier such as ‘‘greatly/strongly/profoundly influenced’’. Also, names of fields are not capitalized unless proper nouns → ‘‘Upanishadic philosophy’’ (‘‘Upanishad’’ is capitalized when the text is meant, but the field descriptor takes lower-case ‘‘philosophy’’).

Step-by-step correction reasoning
Step 1: Replace ‘‘more influenced’’ → ‘‘greatly influenced’’ (or ‘‘profoundly influenced’’).Step 2: Write the discipline phrase as ‘‘Upanishadic philosophy’’.

Corrected version
‘‘… who lived in the latter half of the nineteenth century, were greatly influenced by Indian philosophy, in particular by Upanishadic philosophy.’’

Common pitfalls

• Using ‘‘more’’ without an explicit standard of comparison.
• Over-capitalizing common academic disciplines.

Final Answer
were more influenced by Indian philosophy, in particular by Upanishadic Philosophy.