Under which one of the following states of matter, the rocks of asthenosphere are lying?

Correct option is A

Introduction
The Asthenosphere is the layer of the upper mantle lying just beneath the lithosphere. Due to the high temperature and pressure, the rocks in the asthenosphere are in a semi-solid state (or 'plastic' or 'viscoelastic' state). This allows the layer to flow very slowly, which facilitates the movement of the overlying rigid tectonic plates (the lithosphere).
Information Booster
· Location: It is the layer of the Earth's upper mantle, located beneath the lithosphere.
· State of Matter: The rocks are in a semi-solid or plastic state.
· Property: This unique state allows the asthenosphere to deform and flow over geological time, despite being composed of solid rock material.
· Mechanism: A combination of high temperature and pressure is responsible for the semi-molten/plastic behavior.
· Plate Tectonics: The slow flow of the asthenosphere is considered the driving mechanism for the movement of tectonic plates.
Additional Points
· Layered solid rocks and Solid rocks: The rocks of the lithosphere (above the asthenosphere) are rigid and solid, but the asthenosphere is explicitly characterized by its plastic (semi-solid) property.
· Liquified rocks: The outer core is liquid, and localized pockets of magma can be liquid, but the bulk of the asthenosphere is not fully liquid.