Question

a glass measuring cup • a 1 - teaspoon measuring spoon • 20 or more old pennies that look dull and dark • 2 or more new steel paper clips (they should not be labeled \smooth finish\ or be covered with paint or plastic.) what you do before you conduct your experiment, set aside one penny and one paper clip. later, you can compare them to the other pictures, parties, pennies and paper clips used in the experi

Explanation:

The sentence is about comparing the set - aside penny and paper clip with the ones used in the experiment. The context is about the experiment materials (pennies and paper clips), and we need a noun that is parallel to "paper clips" in the sentence structure. Among the options, "pennies" fits as it is the plural form of the penny which is one of the experiment materials, while "pictures" and "parties" have no relation to the experiment materials described.

Answer:

pennies