In a homogeneous solution, the fugacity of a component depends upon the

Fugacity is nothing but escaping tendency or effective pressure since at lower pressures it will be equal to pressure and at higher pressures as intermolecular forces come to play the fugacity changes from pressure. So, we physically say fugacity is an function of pressure and in an similar way the temperature dependency can also be said. Since higher the composition of a particular component in solution higher is the fugacity or its escaping tendency we can say fugacity is also a function of composition.