16. Ramps, wedges, and chisels are examples of what type of machines? A. Screw
B. Lever
C. Pulley
D. None of the above

ramps ,wedges ,and chisels are example of inclined plane machine,D none of the above

            The compound illustrated is Hydrocarbon.

Explanation:
                   Propane is a hydrocarbon made up og three carbon atoms and eight hydrogen atoms with a structure as shown below,

                                            H₃C-CH₂-CH₃

Therefore, hydrocarbons consists of only hydrogen (hydro) and carbon (carbon) atoms.

Other options are incorrect because,

Halogens consist of either Fluorine, chlorine, bromine or iodine, which are absent in given compound (propane).

Polyethylene is a polymer (macromolecule) which is made up of repeating units (monomers) called as ethylene (H₂C=CH₂).

Fuctional group is any atom or group of atoms when attached to hydrocarbon gives it a characteristic chemical and physical properties and is absent in given propane.