The most probable and most likely answer to this problem would be C. revealed much about their behavior.
Out of the four options presented in this problem, C. would only need a complete subject to make it a correct sentence. Options A. by closely watching and gathering data and B. to terrifying effect would probably need other more words and/or phrases to make them more complete. D. insect studies, on the other hand, can also be considered as a correct option IF insect become the subject.
The introductory paragraph.
Answer:
Let there are 3 Containers.
Weight of Containers is w1,w2,w3 respectively.
Sand is filled in the containers one by one.
After filling the sand in three containers,
the weight of Containers become W1, W2, W3.
The difference between the weight of container after filling the sand and the actual weight of empty container, will give the weight of sand in that. Container
The difference between the weights (W1-w1) will give us the weight of sand in first container.
The difference between the weights (W2-w2) will give us the weight of sand in Second container.
The difference between the weights (W3-w3) will give us the weight of sand in Third container.
Explanation:
