A, it may constitute a conflicting application for others to apply in the future. Correct.
Chapter 3, Part II of the Patent Examination Guide 2.2 When judging the novelty of an invention or utility model, a patent application document or published patent document for the same invention or utility model submitted to the Patent Office before the filing date and published after the filing date (including the filing date) damages the novelty of the patent application filed on the filing date, which is called a conflict application. Therefore, as long as the conditions are met, it may constitute a conflicting application.
B, make the invention for which the patent is applied become the existing technology. Correct.
Patents are protected. When the patent application documents are published, they are available to the public and become the current technology.
C. the patent applicant may prohibit others from using the patent. Mistake.
The publication of the invention patent does not mean that it is authorized, so it is not protected by the patent law at this time and has no right to prohibit others from using it.
D, the patent applicant may require the use of the same technology units to pay appropriate fees. Mistake.
Article 10 of the Patent Law After the publication of an application for a patent for invention, the applicant may require the entity or individual exploiting the invention to pay an appropriate fee. The D option is "units using the same technology", so please read the question carefully.
To sum up, choose AB.