Question 70Navigation Problems

The correct answer is C) Alphard, Denebola, Acrux. The key factors in selecting the best group of celestial bodies for a fix at the given position and time are their magnitude, azimuth, and altitude. Alphard, Denebola, and Acrux are well-suited because they have high enough altitudes and favorable azimuths for an accurate fix, and their magnitudes are in the optimal range for celestial navigation. The other options are not as suitable - Jupiter and Antares are too low in the sky, Venus is too bright, and Mars, Arcturus, and Spica may not have the optimal azimuth and altitude at the given position and time.