Which one of the following sets of conditions would result in a reaction that is spontaneous at high temperatures but non-spontaneous at low temperatures?

The sets of conditions would result in a reaction that is spontaneous at high temperatures but non-spontaneous at low temperature $\mathrm{\Delta }H>0,\mathrm{\Delta }S>0$.

ΔH and ΔS are negative; the reaction is spontaneous at low temperatures. And so, saying a process is spontaneous at “high” or “low” temperatures means the temperature is above or below, respectively, that temperature at which ΔG for the process is zero.