Answer:
Element:K
Organic compound: 
Inorganic elemental molecule: 
Inorganic compound: 
Explanation:
We are given that an element ,an organic compound ,inorganic elemental molecule and inorganic compound
We have to match the given answer with correct match.
Element: an element is define as the simplest substance which can not be broken down by chemical reactions.
Therefore, in given options we have only one substance is K which can not be broken down by chemical reactions.
Element:K
Organic compound: It is define as the the compound which is formed by carbon and hydrogen .
There is only one compound in which carbons and hydrogens are present
Organic compound: 
Inorganic elemental molecule:It is define as the molecule which is formed by atom of same element.
Hence, inorganic elemental molecule: 
Inorganic compound: It is define as the compound which is formed by two or more atom of different element.
Hence, Inorganic compound: 