Which rock is only formed by regional metamorphism?

Metamorphism, which takes place over the wide regions of the crust is known as regional metamorphism. The majority of the regionally metamorphosed rocks takes place in the regions, which have gone through deformation at the time of an orogenic event.  

Gneiss is only produced by regional metamorphism. Gneiss can be produced by the regional metamorphism of distinct kinds of rocks like shale or granite. It refers to a high-grade metamorphic rock, which signifies that it is produced at high pressures and temperatures.  

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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.