Which of the following is true about the general trend of first ionization energies in transition metals?

• A. (A) First ionization energies increase from left to right for transition metals in all rows.
• B. (B) A greater increase from left to right is seen in the third row than in the first and second rows.
• C. (C) They increase from left to right for only the first row of transition metals.
• D. (A) and (B) are correct.
• E. all of the above

Answer: (E)