The correct answer is: B. slightly sloped.
A regression line is a line that shows the relationship between two variables. The strength of the relationship is indicated by the slope of the line. A line with a steep slope indicates a strong relationship, while a line with a shallow slope indicates a weak relationship. A line with no slope indicates no relationship at all.
In the case of a cost and cost driver, a weak relationship would be indicated by a line that is slightly sloped. This means that there is a small, but positive, relationship between the two variables. The cost driver does have some impact on the cost, but it is not a very strong impact.
The other options are incorrect because they do not indicate a weak relationship. A curved line indicates a nonlinear relationship, which is not what we are looking for. A completely sloped line indicates a strong relationship, and a dotted line indicates no relationship at all.