Select a starting material and a series of reagents necessary to synthesize this compound in as few steps as possible. Enter your selection as a number for the starting material, followed by the letters of the reagents, in the order that you wish to use them, i. e. 3abcf.

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.