Which situation cannot be represented by this equation? 3x+4=19?

i will give brainliest. for the person who shows there work

a) penny is selling candles for $3 each at a fund-raiser. if she starts selling with $4 to her make change, how many candles, x , will she have to sell to end up with $19?

b) penny is selling candles for $4 each at a fund-raiser. if she starts selling with $3 to her make change, how many candles, x , will she have to sell to end up with $19

c) penny has already sold 3 candles at a fund-raiser. if she started selling with $4 to her make change, what is the price, x , of each candle, if she ends up with $19