Ancient rock paintings have been found in
a. spain and russia
b. france and turkey
c. spain and france
d. india and china

A) Spain- definitely true, see Altamira. I don't know of any in Russia though...
b)France- the Famous Lascaux! I don't know of any in Turkey though
c) As we've seen both Spain and China had it- this is definitely the right option!
d) India had them- a lot, but China had them too, (Hua Mountain)- so this is a right option as well.

Quick research: Russia has them too (Kapova), but I think Turkey might have had some too (see the archeological sitein Gobekli Tepe.

So in the end, all the options seem good, but i'd go for c) if I had to choose (those are the most famous ones)

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.