Which sentence does not contain any errors in comma usage?

a. a paper mill eventually opened in spain and, the art of making paper spread from here.
b. the inventor gathered bark and rags and then he or she made a pulp.
c. the chinese kept the formula to themselves, but, in 751 the arabs learned the chinese secret.
d. some papermakers used rags, and others used animal hides.

i will give a brainliest answer and you can my best sister or brother.

What is mostly clearly a disadvantage of living in a world dominated by the presence of televisions according to niel postman?

What is the meaning of the word "caches" as it is used in paragraph 6

Read the paragraph. theodore roosevelt was the greatest president because as a leader of the progressive party, he brought about much-needed social, political, and economic reform. one of his economic reforms was to break up many large business trusts. by doing so, he took economic power out of the hands of the wealthy and powerful corporations and placed it in the hands of the ordinary people. theodore roosevelt’s reform policies, known as the square deal, to give the average citizen an equal share of opportunities. which sentence is the thesis of this paragraph? theodore roosevelt was the greatest president because as a leader of the progressive party, he brought about much-needed social, political, and economic reforms. one of his economic reforms was to break up many large business trusts. by doing so, he took economic power out of the hands of the people and placed it in the hands of the ordinary people. theodore roosevelt’s reform policies, known as the square deal, to give the average citizen an equal share of opportunities.