Which of the following is true regarding equestrian portraits?
a.
the first examples were seen in the nineteenth century.
b.
they exaggerate the facial features and perfection of the subject in the painting.
c.
they were a form of social protest that was popularized by picasso.
d.
they used the image of a horse beneath a political figure to convey the subject supreme power and leadership.

The true about equestrian portraits is:

d.  They used the image of a horse beneath a political figure to help convey the subject supreme power and leadership.

Explanation:

The reason behind the answer is because first, the first examples of equestrian portraits are not from the 19th century. People have been portraying themselves on horses since the Chinese dynasties before the unification of china. Second, exaggerating facial features is not a rule for equestrian portraits. Third, it didn't become popular just because Picasso used it to manifest his discontent. People have loved horses since they domesticated them. Fourth, they always used horses to provide political figures another level of superiority, Napoleon white horse portrait is an example, his horse was a monster, while he was pretty short.

modernism is a 20th century movement

pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."