For 30 points!me understand this question
which of the following conditions results in an activation energy that allows the reaction to occur more easily?
a) decreasing the surface area of the particles
b) reducing the concentrations of reactant molecules
c) decreasing the temperature
d) adding a catalyst

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3