Size
As the charge increases (becomes more positive), the size decreases.
Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.
The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.
K > K+ > Ca2+
Answer: A
Ionization Energy
As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.
Be is closest to the top of the periodic table and has the highest ionization energy
Ca is the next closest to the top and has a medium size ionization energy
Sr has the lowest ionization energy.
Answer C is backwards.
Answers A B and E are all in the wrong order of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.
Polymers
A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.
DNA is a polymer
A glass bottle is made from SiO2 and is not a polymer
Ice crystals are actually water molecules. Those crystals are not polymers
Hair Proteins (like wool and silk) are made of polymers.
Rubber used for car tires are polymers.
You should count 3 items as your answer.