Read the following excerpt from frederick douglass’s “learning to read and write” and answer the question.

as i writhed under it, i would at times feel that learning to read had been a curse rather than a blessing. it opened my eyes to the horrible pit, but to no ladder upon which to get out. in moments of agony, i envied my fellow slaves for their stupidity. i have often wished myself a beast. i preferred the condition of the meanest reptile to my own.

which word is closest in meaning to the word writhed in the excerpt above?

wiggled
agonized
squirmed
visualized