Final answer:
Options A, C, and D are redundancies, while option B is not.
Step-by-step explanation:
A. Exactly identical: The word 'exactly' already implies sameness, so it is redundant to use both words together.
C. Basic fundamentals: The word 'fundamentals' already implies basics, so it is redundant to use both words together.
D. Each and every: Both words essentially mean the same thing, so using both together is redundant.
B. Combined theory is not a redundancy as it combines two different concepts into a single phrase, rather than expressing the same idea twice.