Answer: a. By painting him on horseback, any imperfections were easily minimized.
Explanation:
The painting in question features King Phillip IV on horseback and was most probably done to minimize any deficiencies or imperfections that would appear if he was standing.
Kings in the past (and indeed the present) needed to portray a certain image of strength and grace which was why the way they were to appear to the public needed to be scrutinized. Portraits are an example of this which was why Philip had to be painted in such a way as to minimize imperfections.
In 4/4 time a whole note gets FOUR beats; a half note gets TWO beats, and a quarter note gets ONE beat. Based on what you saw above, that 4/4 time signatures mean four beats to the measure and the quarter note gets the beat
The answer to the question presented above would be 'equal temperament'. The concept of equal temperament divide the octave into 12 tones. This helps avoid the harmonies to be deemed unpleasant when the music is played.