Answer:
C) variable-interval schedule
Explanation:
Based on the scenario being described within the question it can be said that Daniel's watching behavior is likely to be reinforced based on a variable-interval schedule. This schedule refers to when the reward is given after a random amount of time has passed, which is not predictable. In this case seeing since Daniel does not know when the ducks will pass but knows that they will pass, then sooner or later the "reward" will be introduced.
A cool heirloom
Some national treasure type stuff
Maybe food-If I feel like being nice
Said to be the same type of stimulus to the Texas Revolution that the Stamp Act was to the American Revolution, was initiated by Lucas Alamán y Escalada, Mexican minister of foreign relations, and was designed to stop the flood of immigration from the United States to Texas. The law came as a result of the warning and communications of Manuel de Mier y Terán, who made fourteen recommendations directed toward stimulating counter-colonization of Texas by Mexicans and Europeans, encouraging military occupation, and stimulating coastal trade.