Final answer:
The proper running header in APA style is 'b) Jones, 2', which includes the author's last name followed by a comma and the page number.
Step-by-step explanation:
Among the options provided, the correct format for a running header in APA style is b) Jones, 2. This format includes the last name of the author and the page number, with a comma separating the two elements. This style is commonly used when writing academic papers and following the guidelines set by the American Psychological Association (APA).
There are five levels of heading in APA Style. Level 1 is the highest or main level of heading, Level 2 is a subheading of Level 1, Level 3 is a subheading of Level 2, and so on through Levels 4 and 5. The number of headings to use in a paper depends on the length and complexity of the work.