When quantity supplied equals quantity demanded:

A. there is disequilibrium
B. the marked is cleared
C. there is excess quantity demanded.
D. there is excess quantity supplied

I'm stuck between C and D but I think it's D?

I doubt if either of your answers is correct. (Please note that I'm not an economist.)

I think this site has your answer.

http://en.wikipedia.org/wiki/Economic_equilibrium

When quantity supplied equals quantity demanded, it means that the market is in a state of equilibrium. This is because at this point, the quantity of a good or service that suppliers are willing to provide is exactly equal to the quantity that consumers are willing to purchase.

In this case, option B is the correct answer - the market is cleared. This means that all goods or services produced are sold, and there is no excess quantity demanded or supplied.

Option D, which suggests excess quantity supplied, would imply that there is an overproduction of goods or services, resulting in unsold inventory.

Option C, which suggests excess quantity demanded, would mean that there is unmet demand in the market, indicating a shortage of goods or services.

So, the correct answer is B, the market is cleared.