What is common to all elements in the same group in the periodic table?
they have the same number of neutrons
they are all nonmetals
they have the same number of outer electrons
their properties are very different

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.