There Are Two Sellers in the DVD Market, Wen and Ahmed

There are two sellers in the DVD market, Wen and Ahmed. If the market price were $5 per DVD, Wen would be willing to sell 10 DVDs and Ahmed would want to sell 15 DVDs. If the market price were to rise to $7, then:

A) we can confidently say that market quantity supplied is at least 25 DVDs.
B) we can't know the effect on market supply because we don't have the full graphs for these two sellers.
C) the market quantity supplied must be less than 25.
D) the market quantity supplied must be between 10 and 15 DVDs.