The correct answer is option 'B': Weighing bucket type.

Explanation:
- A weighing bucket type raingauge is a type of raingauge that measures the accumulated rainfall over a period of time by using a weighing mechanism.
- This type of raingauge consists of a bucket that collects the rainfall and a weighing mechanism that measures the weight of the collected water.
- The weight of the water collected in the bucket is directly proportional to the amount of rainfall.
- As the rainfall accumulates in the bucket, the weight of the water increases, and this increase in weight is recorded by the weighing mechanism.
- The weighing mechanism is connected to a recorder or data logger that plots the accumulated rainfall against the elapsed time.
- The recorded data can be used to analyze the rainfall pattern and calculate the total amount of rainfall over a specific period.
- The advantage of a weighing bucket type raingauge is that it provides a continuous record of rainfall over time, allowing for more accurate analysis and prediction of rainfall patterns.
- This type of raingauge is commonly used in meteorological stations, hydrological studies, and water resource management.
- Other types of raingauges, such as the tipping bucket type and float type, can provide information about the intensity and duration of rainfall events but do not directly give a plot of accumulated rainfall against elapsed time.
- The tipping bucket type raingauge measures the amount of rainfall by counting the number of times a bucket tips over, which provides information about the intensity and duration of rainfall events.
- The float type raingauge measures the amount of rainfall by using a float that rises with the water level, which provides information about the intensity of rainfall events.
- Therefore, the weighing bucket type raingauge is the most suitable option for obtaining a plot of accumulated rainfall against elapsed time.