Which statements describe characteristics of a restrictive clause? select three options

- They just add information, they are not essential to the meaning of the    sentence.  

-  They are offset with commas.

-  They are introduced by relative pronouns: who, which, whose, where, etc.

hope this helps, have a good day :)

the answer should be b.

explanation:

it should be b because she researched before writing so it would be in past tense. "the author researches her subject before she had written the first draft.

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.