How were scholars able to translate hieroglyphic symbols?

a.
scholars compared hieroglyphics to cuneiform and found enough similarities to create an alphabet of the egyptian writing system.

b.
archaeologists unearthed a set of papyrus scrolls that had served as a dictionary in ancient egypt.

c.
by comparing a message written in both hieroglyphics and greek, scholars were able to translate the hieroglyphic symbols.

d.
because early hieroglyphics were picture writing, scholars could decipher their meaning and then match them to more modern egyptian writing.