Final answer:
The volume of the irregular-shaped body can be determined by subtracting the final water level from the initial water level after submersion, which yields a volume of 75 cm^3.
Step-by-step explanation:
To find the volume of an irregular-shaped body submerged in water, one can use the water displacement method. This method is based on the principle that the volume of water displaced by an object submerged in water is equal to the volume of that object. According to the information provided, the water level rises from 225 cm3 to 150 cm3 upon submersion of the body. Thus, the volume of the irregular body is the difference between these two levels.
The calculation is as follows:
Initial Water Level: 225 cm3
Final Water Level: 150 cm3
Volume of Irregular Body = Initial Water Level - Final Water Level = 225 cm3 - 150 cm3 = 75 cm3
Therefore, the correct answer is a) 75 cm3.