Answer:
K, Rb, Sr, Sn
Explanations:
What is electronegativity?
This is the ability of an atom or element to attract electron to itself. In the periodic table, eletronegativity decreses down the groups, and increases from left to right across periods.
According to the question, we are to rank the following elements according to their increasing electronegativity that is from the least electronegative to more electronegative element.
Therefore the choice that ranks the elements in order of increasing electronegativity is K, Rb, Sr, Sn