Question

What caused Francesco Lana to plan an airship?
A.
the measurement of mercury
B.
the invention of balloons
C.
the mixture of different gases
D.
the discovery of air having weight

Answer 1

Answer:

I think it's B. the invention of balloons

Explanation:

"It is no exaggeration to say that Lana's ideas lay behind the development of the balloon and led to the successful flight of the Montgolfier brothers in 1783."

source- http://www.faculty.fairfield.edu/jmac/sj/scientists/lana.htm

hope this helps :-)

Answer 2

i’m pretty sure it’s b!