Before Lyddie leaves Lowell, what does she do to protect Brigid? A. She asks Brigid to come with her to her family’s farm.
B. She tells Mr. Marsden’s boss about what happened with him and Brigid.
C. She makes Brigid sign a new petition to get Marsden fired.
D. She gives Brigid a letter addressed to Marsden’s wife that would expose Marsden.

D. She gives Brigid a letter addressed to Marsden's wife that would expose Marsden.

Explanation:

Page 172, "...I've written a letter to Mr. Marsden. I told him if he dismissed you or bothered you in anyway I would tell his wife exactly what happened in the weaving room. Now here is the letter addressed to her..."

i guess the cause and effect would show how being around the smoke(the cause) can have negative effects on the body.

explanation:

well if u read the book you would know that she meant to