Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals.

Introduction:
Gneiss is a type of metamorphic rock that is formed from the transformation of preexisting rocks under high pressure and temperature conditions.

Answer:
The correct answer to the question is option 'D', which states that Gneiss is obtained from Igneous metamorphic rocks.

Explanation:
Gneiss is a type of metamorphic rock that is formed from the transformation of preexisting rocks under high pressure and temperature conditions. These preexisting rocks can be either igneous or sedimentary, but in the case of Gneiss, they are mainly igneous rocks that undergo metamorphism.

The process of forming Gneiss from igneous rocks involves the following steps:

1. Heat and Pressure: The igneous rocks are subjected to high temperatures and pressures that cause them to undergo metamorphism. The heat and pressure cause the minerals in the rocks to recrystallize and reorganize, forming new minerals and changing the structure of the rock.

2. Foliation: During the metamorphic process, the rock develops a layered structure called foliation, which is a characteristic feature of Gneiss. The foliation is caused by the alignment of minerals in the rock in parallel layers or bands.

3. Mineral Composition: The mineral composition of Gneiss is different from that of the original igneous rock. The most common minerals found in Gneiss are quartz, feldspar, mica, and amphibole.

In conclusion, Gneiss is obtained from igneous metamorphic rocks, which are formed from the metamorphism of preexisting igneous rocks under high pressure and temperature conditions. The process involves the recrystallization and reorganization of minerals in the rock, the development of foliation, and the formation of new minerals.