Which plot is the adsorption isobar for chemisorption (T and  $\frac{x}{m}$ represents temperature and extent of adsorption respectively)

Adsorption isobar is the graph between x/m vs T (at constant pressure). In the given graph, first x/m increases on increasing the temperature because it will provide sufficient energy to smoothen the process of adsorption but as the temperature continuously increasing, this leads to increase in kinetic energy of adsorbate molecules and reduces adsorption process.