What's metamorphism?

a. the process by which new minerals form from existing minerals that become unstable at earth's surface
b. the process by which new minerals form as a result of biological processes in living organisms
c. the process by which new minerals form as a result of precipitation from an aqueous solution
d. the process by which new minerals form from existing minerals as a result of elevated temperature or pressure

The correct answer is option D.

Explanation:

Metamorphism : It defined as process in which change in composition and texture of the rock takes place without melting the rock.These changes in the rock are brought out by the effect of heat , pressure and introduction of an active chemical substance.

During this process crystal structure of the rock also changes although the rock remains in solid phase.

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.