To avoid plagiarism and properly incorporate a source you want to use in writing a paper, you would select the following options:
a. making sure to cite the source accurately.
b. either paraphrasing or directly quoting the text with a citation.
c. by quoting the source in full.
Each of these options involves properly acknowledging the source's contribution to your work, thus avoiding plagiarism.
Option d, "by finding an additional source with a competing point of view," does not directly address the use of the original source and may not be relevant to the question of avoiding plagiarism with respect to the specific source you want to use.