Answer: From your question, you want to know the sentence, that is an example of descriptive statistics. For easy understanding please let me arrange the sentence as follows;
a. She characterizes the first-year students at the college as consisting of 543 males and 457 females.
b. She randomly chooses the 100 students to represent the 1,000 volunteers.
c. She infers that if all 1,000 students had done the experiment, the results would show that an average of 34% (plus or minus sampling error) of new words were mistakenly identified as original words because they were conceptually similar.
YOUR ANSWER:
The sentence that properly show an example of descriptive statistics is;
Option c. She infers that if all 1,000 students had done the experiment, the results would show that an average of 34% (plus or minus sampling error) of new words were mistakenly identified as original words because they were conceptually similar.
Descriptive statistics is a result that quantitatively summarize, a set of results or information, using statistical method.
Because option c describes the result in terms of percentage average of a set of data. Instead of pointing out the result of each student, he used descriptive statistics to give the percentage average.