State of matter is defined as the different forms of matter. The four states of matter are solid, liquid, gas, and plasma.
Solid: closely packed together and have definite shape.
Liquid: the interaction between the atoms lie between solid and gases and have indefinite shape.
Gas: compressible in nature and has indefinite shape.
Plasma: it exists in ions and has indefinite shape.
According to the above definitions, liquid is the state of matter has atomic spacing that is close together and has indefinite shape.
Thus, liquid is the correct answer.