From : V0 = (h/e)ν - φ0/e what can we best infer about the stopping potential V0 and the incident frequency v?

the stopping potential is inversely proportional to the incident frequency. there is no dependence of the stopping potential on the incident frequency. the stopping potential varies linearly with the incident frequency. φ0/e  is the slope of the graph between the stopping potential and incident frequency.

the stopping potential varies linearly with the incident frequency.

compare the given equation with y = mx + c. You shall see that stopping potential varies linearly with frequency.