If you cannot think of a better way to say what another author said, it is best to:.a. keep reading the passage until you can paraphrase. b. quote the author, no matter how long or how often.
c. substitute a few words in the sentence for synonyms.
d. leave that source out of your paper.

B.

Explanation:

Quoting can be defined as taking exact phrase or sentence from other text and adding it into one's writing.

Quotes are incorporated into a text when it is difficult to paraphrase the text. Sometimes paraphrasing the text also takes away the essence of the text, in the case also, the writer include the quote.

The rule of quoting a text is always to cite the source, the author, etc to avoid plagiarism.

So, the correct way to say what another author is saying without hampering the true message would be to include the author's quote (using correct citation format). Even the long quotes can be included and everytime the quote is included remember to cite it.

Thus the correct option is B.

answer; (d) i believe that the correct answer is ; /// a new invention lowers the cost of production;