Here's why:

* Felsic rocks are rich in silica (SiO2) and have a light color.

* Rhyolite is an extrusive igneous rock with the highest silica content among the three.

* Andesite is intermediate in silica content.

* Basalt is mafic, meaning it is lower in silica and higher in magnesium and iron, giving it a darker color.

Therefore, rhyolite is the most felsic of the three rocks.