Question

The transition word(s) that would best introduce an example is ???

Therefore

In summary

For instance

Later

Answer 1

For instance would be best.

Answer 2

Answer: the transition word that would best introduce an example is for instance.

Explanation: there are other transition words to introduce examples. The one that is kind of strange for students is e.g. which means "exempli gratia" in latin and "for example" in English.