Regarding silica
I) Quartz is amorphous form of silica
II) Silica dissolves in NaOH
III) Silica dissolves in HF
The correct combination is

Quartz is a crystalline form of silica
NOTE:$\left.\begin{array}{l} \mathrm{Quartz} \\ \mathrm{Tridymite} \\ \mathrm{Crystobalite} \end{array}\right\} \mathrm{are}\mathrm{Crystalline}\mathrm{forms}$
 

$\left.\begin{array}{l} \mathrm{Jaspar} \\ \mathrm{Agate} \\ \mathrm{Onyx} \\ \mathrm{Kieselgar} \end{array}\right\} \mathrm{aretheamorphousforms}$

1) ${\text{SiO}}_2+6\mathrm{HF}\to \underset{ \mathrm{Fluosilisic}\mathrm{acid} }{{\mathrm{H}}_2{\mathrm{SiF}}_6}+2{\mathrm{H}}_2\mathrm{O}$

SiO₂ is soluble in HF due to the formation of fluosilicic acid and hence HF is used for ETCHING process
2) $\underset{ \mathrm{Acid} }{{SiO}_2}+\underset{\left(\mathrm{aq}\right)}{2\mathrm{NaOH}}\to \underset{ \mathrm{sodiumsilicate} }{{\mathrm{Na}}_2{\mathrm{SiO}}_3}+{\mathrm{H}}_2\mathrm{O}$

$\underset{\text{ Acid }}{Si{O}_2}+\underset{\left(aq\right)}{2\mathrm{KOH}}\to {\mathrm{K}}_2{\mathrm{SiO}}_3+{\mathrm{H}}_2\mathrm{O}$

SiO₂ is soluble in base like NaOH, KOH due to the formation of soluble silicates
SiO₂ donot soluble in any other solvents