This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostats, Subject name: Social & Preventive Medicine
What is Frequency Curve? 
Select and explain. 
A. When the observation is large and group interval is reduced, frequency polygon loses its angulations to become a curve, B. It is a frequency polygon presenting variation by line, it shows the trend of event over a period of time, C. It is a graph of cumulative frequency distribution, D. It is an area diagram of frequency distribution developed over a histogram
A: When the observation is large and group interval is reduced, frequency polygon loses its angulations to become a curve
Answer: A: When the observation is large and group interval is reduced, frequency polygon loses its angulations to become a curve 
Explanation: Frequency Curve-When the observation is large and group interval is reduced, frequency polygon loses its angulations to become a curve. Line cha/graph-It is a frequency polygon presenting variation by line, it shows the trend of event over a period of time. Cumulative frequency diagram (OGIVE)-It is a graph of cumulative frequency distribution. Frequency Polygon-It is an area diagram of frequency distribution developed over a histogram.