Final answer:
Andalusite forms under crustal temperature and pressure conditions of 600°C and 4000 atmospheres.
Step-by-step explanation:
The correct answer is c) 600°C and 4000 atmospheres. According to the pressure-temperature diagram for aluminosilicate minerals, andalusite forms at temperatures around 600°C and pressures of approximately 4000 atmospheres. This information is depicted in Figure 2.21, which shows the stability fields for andalusite, kyanite, and sillimanite.