Short Answer 
The term “multiplied” is the most accurate choice to describe a significant increase in the student body over a short period, suggesting rapid growth. Other options like “added,” “raised,” and “boosted” fail to convey the same level of clarity or specificity regarding the extent and speed of the increase.
Step 1: Identify the Key Concept
The sentence that needs to be modified discusses a significant increase in the number of students over a short period of time. The key term here is “multiplied,” which suggests a rapid growth. Specifically, it conveys that the student body has not only grown, but has significantly doubled within less than a year, indicating a dramatic increase in numbers.
Step 2: Analyze the Other Options
Understanding why the other options are unsuitable is crucial for clarity. Consider the following:
- “Added” implies a vague increase, leaving the extent of growth unclear.
- “Raised” does not fit the context and fails to indicate a quick increase.
- “Boosted” also lacks specificity regarding the extent and pace of growth.
Step 3: Conclude the Choice
Ultimately, selecting “multiplied” effectively encapsulates the essence of the statement by accurately describing how the student body has expanded dramatically. This short and impactful term clearly aligns with the idea of a rapid and significant increase, complementing the context of doubling within a brief timeframe.