Step 1: Evaluate each sentence for grammatical accuracy.
- Sentence A: Correct. "The dean asked for additional funding" is grammatically sound. - Sentence B: Incorrect. The phrase "discussed about" is erroneous. The correct phrasing is "discussed the new project." - Sentence C: Incorrect. The preposition "in" is incorrect in "good in." It should be "good at." - Sentence D: Correct. "Neil is transitioning into a new phase of life" is grammatically correct. - Sentence E: Incorrect. The preposition "on" is incorrect in "emphasized on." The correct phrasing is "emphasized the need." - Sentence F: Correct. "This car is superior to the previous one in terms of efficiency" is grammatically acceptable.
Step 2: Identify the group of correct sentences.
Sentences A, D, and F are grammatically correct.
Final Answer: \[\boxed{\text{A (A, D & F)}}\]