A researcher is measuring the level of a certain chemical contained in a certain type of paint. On average, each can of paint contains 10 percent of the chemical. How many cans of paint should the sample contain if the researcher wants to be 95% certain of being within 1% of the true proportion of this chemical (i.e. margin of error = 0.01)?

A.645

B.18

C.3,458

D.4,886