Group 2 trends for magnesium and barium Steps:

• Identify key properties compared: likely melting/ionization energy (decreases down group) and reactivity rate (increases down group).
• For melting point or ionization energy: magnesium higher, barium lower.
• For reaction rate with water/acid: magnesium slower, barium faster.
• Match to choice with all correct comparisons: higher (Mg) lower (Ba); slower (Mg) faster (Ba).

Not enough information: Question lacks specific properties or table rows, making comparisons ambiguous.

Final answer: Not enough information.