Read the following sentences carefully.
A. The dean asked for additional funding.
B. The boss discussed about the new project with his team.
C. Radhika is good in data interpretation.
D. Neil is transitioning into a new phase of life.
E. Rajat emphasized on the need for consistency in XAT preparation.
F. This car is superior to the previous one in terms of efficiency.
Which of the following options contains only grammatically CORRECT sentences?

Let us look at the sentences and try eliminating the grammatically incorrect sentences, 

C. Radhika is good in data interpretation.
This sentence is wrong as it should be "good at data interpretation"

E. Rajat emphasized on the need for consistency in XAT preparation.
This sentence is wrong as it should simply be "emphasized the need"

B. The boss discussed about the new project with his team.
This sentence is wrong as it should just simply be "discussed the new project" 

Hence the grammatically correct sentences are A, D, F.