The answer is C, coincidentally. A wouldn't be correct because similarly is when the other group agrees. Here, two groups are disagreeing. B would fit but it would not be the most logically connected word. C means when one group agrees on something but the other group disagrees more with the decision. D would fit but it would not because there is no direct contrast. Some teachers believe that school should start later in the year and parents believe that school starts earlier in the year. Therefore it can be concluded that C is the best-fit word to be placed in the blank.
The process is called industrialization because of all the manufacturing jobs created by machines and that is also the beginning off urbanization when many people started to move from farms to cities to seek jobs
D) police force and sewer in london
I do not know any of the answers since I did not read the passage, the next time you could put a link to the passage so it's better to comprehend. That's my best suggestion.
I suggest: Put some context and background knowledge <em>before</em> putting the questions themselves for people to answer. If you don't do that, then people would be coming into this blindly.