The sentences that should be included in a summary of the text are:
- John Fitch combined old methods of constructing boats with new technology to create the first steamboats.
- Fitch's boats cost too much to make.
The first option about Robert Fulton becoming known as “the father of steam navigation” provides important context but is not as central as the points about Fitch's contributions and the financial challenges he faced. The last option about riding on a steamboat is subjective and not relevant to the summary of the text.