A. require scholars to credit birds with a far earlier origin than previously thought - Correct. could force a revision and could require are in parallel.
B. scholars may be required to credit birds with a far earlier origin than previously thought - Incorrect. Parallelism error and passive.
C. require a crediting by scholars of birds with a far earlier origin than previously thought - Incorrect. 'require a crediting' is awkward.
D. , compared to what was previously thought, require scholars
...
B. scholars may be required to credit birds with a far earlier origin than previously thought - Incorrect. Parallelism error and passive.
C. require a crediting by scholars of birds with a far earlier origin than previously thought - Incorrect. 'require a crediting' is awkward.
D. , compared to what was previously thought, require scholars
...
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