349. On 4 September your 1813 zone time DR position is LAT 24° 18.0' S, LONG 95° 16.0' E. Considering their magnitude, azimuth, and altitude, which group includes the three stars best suited for a fix at star time?

Rasalhague, Fomalhaut, and Spica are the best choice because they offer good brightness, altitudes between 20 and 70, and a wide spread in azimuth, resulting in a strong and accurate star fix geometry given the specified position and date/time.