Which answer describes the simpler problems that could be used to solve this story problem? phil bought stamps for his collection. he bought 4 sports stamps and 2 holiday stamps. he also bought 4 times as many president stamps as holiday stamps. how many stamps did phil buy for his collection? a. calculate how many more sports stamps than holiday stamps phil bought. multiply that answer by 4. add the product to the number of holiday and president stamps. b. calculate how many more sports stamps than holiday stamps phil bought. subtract that answer from the number of holiday and president stamps. c. calculate the number of president stamps that phil bought. add the number of president stamps to the number of sports and holiday stamps. d. calculate the number of president stamps that phil bought. subtract the number of president stamps from the number of sports and holiday stamps.