Which of the following is chemically inert?

Answer: Option A

Among the following Sand particles are chemically inert.
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size.
The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica, usually in the form of quartz, which, because of its chemical inertness and considerable hardness, is the most common mineral resistant to weathering.