Suppose spencer and kate are the only two demanders of lemonade. Each month spencer buys 6 glasses of lemonade when the price is $1 per glass and he...

Suppose spencer and kate are the only two demanders of lemonade. Each month spencer buys 6 glasses of lemonade when the price is $1 per glass and he buys 4 galsses when the price is 1.50 per glass. Each month kate buys 4 glasses of lemonade when the price is 1.00 per glass and she buys 2 glasses when the price is $1.50 per glass which of the following points is on the market demand curve