Question

question 30
samuel morse invented:
a mechanical reapers
b machine tools that made interchangeable parts for guns and clocks
c telegraphs
d steamships

Explanation:

Samuel Morse is known for inventing the telegraph. The mechanical reaper was invented by Cyrus McCormick. Eli Whitney is associated with machine tools for interchangeable parts. Steamboats were developed by people like Robert Fulton.

Answer:

C. Telegraphs