Answer:

Explanation:
To determine whether a combination of common salt (sodium chloride) and iron filings is an element, mixture, both mixture and element, or a compound, we need to understand the definitions of these terms.

Elements:
Elements are substances that cannot be broken down into simpler substances by chemical means. They are pure substances and are made up of only one type of atom. Examples of elements include hydrogen (H), oxygen (O), and iron (Fe).

Mixture:
A mixture is a combination of two or more substances that are physically combined and can be separated by physical means. Mixtures do not have a fixed composition and can have varying proportions of their constituent substances. Examples of mixtures include a mixture of salt and water, air, and a salad.

Compounds:
Compounds are substances that are made up of two or more different elements chemically combined in fixed proportions. They have specific chemical properties and can only be separated into their constituent elements through chemical reactions. Examples of compounds include water (H2O), carbon dioxide (CO2), and sodium chloride (NaCl).

Analysis:
In the given combination of common salt (sodium chloride) and iron filings, both substances are already in their elemental form. Sodium chloride is an ionic compound made up of sodium (Na) and chloride (Cl) ions, while iron filings are composed of iron (Fe) atoms. Therefore, the combination of common salt and iron filings is a mixture.

Conclusion:
The correct answer is option B) Mixture. The combination of common salt and iron filings is a mixture because it is a physical combination of two substances that can be separated by physical means.