1. On the basis of extensive calculations and models, astronomers in the 1990 s predicted that the collision of two neutron stars or a neutron star and a black hole could release a massive burst of gamma rays in an event called a kilonova. This was confirmed with observations in 2017 . Which choice completes the text with the most logical and precise word or phrase? A) theory B) evidence C) constant D) experiment

1. The problem gives a statement about a theoretical prediction by astronomers in the 1990s regarding kilonova events. They predicted that the collision of two neutron stars or a neutron star and a black hole could release a burst of gamma rays. 2. The statement then says, "This was confirmed with \(\underline{\ \ }\) in 2017." To complete the statement, we need to select the word or phrase that best reflects how the prediction was verified. 3. Let’s analyze the options: - **A) theory:** This does not fit because the confirmation is not another theory, but an observation or measurement. - **B) evidence:** This fits logically since an astronomical observation confirming the prediction is considered evidence. - **C) constant:** This is unrelated to the context. - **D) experiment:** While experiments are conducted to test theories, astronomical events are observed rather than experimentally set up in a controlled environment. 4. Therefore, the most logical and precise choice is: **B) evidence.**