C. When price is too high, people are less willing to purchase the good, so demand is lower when price is higher. (Demand curve is always slopping downwards as a result). As the price is high, producers are more willing to sell their goods (I.e. bonds) which will give them more money per unit good being sold. This will result in Quantity Supplied (Qs) being greater than Quantity Demanded (Qd), and so, there is a surplus of bonds in the market. This will cause a downward pressure to apply on price, so that Qd = Qs eventually.
Hope this helps!
