If there is just one path for current to flow through: a. it is a series circuit. b. there will be no resistance. c. the current will be measured in ohms. d. charge will accumulate.

A single circuit path is the defining characteristic of ...

... A. it is a series circuit.

Comments on the other answer choices

In specific circuits, there may be no resistance, or charge may accumulate, but those characteristics are not necessarily related to there being one current path.

Current is usually measured in amperes; resistance is measured in ohms.

from the word list given, the most suitable words that relate to the reason information were written would be:  

objectivity: lack of bias, judgment, or prejudice

accuracy: free of mistakes, to be correct

authority: the ability to tell people what to do or believe in

content: to be satisfied  

it can be said that the author made the article to present objectivity, to provide accurate information, to be the authority in the subject that he or she writes, and to be satisfied of the information quality given out.