the correct answer is (e). Please explain why. Thank you!

Figure 12: 1000 Consider all of the colored lines (regardless of solid vs dashed) as valid phase boundaries. 800 Temperature (C) 600 400 200 B 7 0 20 40 60 80 100 (Sn) (Au) [32] Composition (wt% Au) Referring to Figure 12, what is/are the equilibrium phase(s) for a system with overall composition of 70 wt% Au at 300C ? (a) L (b) S+L (c) S+S (d) 8+ (e) S+L