which, if any, of the following processes is spontaneous under the specified conditions?

which, if any, of the following processes is spontaneous under the specified conditions?

a. h20(l)->h2o(s) at 25degrees celsius

b.CO2(s)->CO2(g) at Odegrees celsius

c.2h20(g)->2h2(g)+O2(g)

d. C(graphite)->C(diamond) at 25degrees celsius and 1 atm