Step 1: Analyze the data.
The key factors to consider here are the average number of leave days (a), the structure of the teaching hours (c), and the financial implications (e) of hiring extra instructors.
Step 2: Evaluate each combination.
- (A) While point (a) and (b) are valid reasons, the fact that instructors have unique teaching styles does not directly argue against hiring extra instructors, especially if they only serve as backups.
- (B) Point (d) about part-time instructors being unavailable is relevant, but point (e) about paying extra instructors even when they might not be needed adds weight to the argument against hiring additional staff.
- (C) Points (a), (c), and (e) present a strong case: instructors only take two days of leave a month (point a), classes are conducted 5 days a week (point c), and extra instructors would still need to be paid even when they are not teaching (point e). This combination highlights the inefficiencies of recruiting extra instructors.
- (D) Point (c) is valid, but point (e) about paying extra instructors even when not teaching makes point (b) about part-time instructors being unavailable seem secondary.
- (E) Points (a), (b), and (c) focus on the logistics of teaching and leave but don’t address the cost concerns as strongly as option (C) does.
Step 3: Conclusion.
The best combination is (C), which clearly outlines the logistical and financial reasons for not hiring extra instructors on a regular payroll.