Who helped Dred Scott sue for his freedom? his master
his best friend
northern abolitionists
others who were enslaved

among the options given on the question the correct answer is option d.

tan winces when she describes her mother’s english as “broken.”

explanation: the excerpt is from "mother tongue" is an essay by amy tan. the purpose of writing this essay was describe the challenging situation of someone who was raised in a family where the parents could not speak proper english and the influence of the situation.people also could judge the individual for the poor english.

however, amy tan described the english of her mother as broken according to the other people. but every time, she referred as broken she winced. because, she began to understand the world with her mother's english.she could understand her mother's english.

therefore, tan winces when she describes her mother’s english as “broken.”

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: