Which hypothesis is most supported by astronomers? A- The universe is currently expanding and will continue to expand.

B- Stars could burn out, causing the universe to become dark and cold.

C- Gravity could pull galaxies back together, causing a reverse of the big bang.

D- Dark energy will pull the universe together to form a massive black hole.

HURRY!!

option A is the most supported hypothesis by astronomers

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.