The type of ink used for printing changed from water-based to oil-based.
Explanation:
The point that is not relevant, or necessary, to support the author's claim about the effects of the printing press is that "The type of ink used for printing changed from water-based to oil-based."
This particular option did not express the importance or effect of the printing press. The effect of the printing press actually means what impact the printing press is making in various areas of human life.
Definitely, Option C is not relevant or necessary to support the author's claim.
The main idea is more specific than a theme . The theme could be food and the main idea might be that people need to be more careful about what they eat . Hope that helped
Sentence structure is important because it provides us with the framework. Framework is for the clear written expression of our ideas. A complete sentence always contains a verb.