Answer:
Perspective is the way that one looks at something
Im pretty sure that it is 8 lines.
To combine these sentences together to flow neatly and be grammatically correct you could say: Early airships such as zeppelins were filled with hydrogen, but today's blimps use helium instead. This is the correct answer out of your choices.
Your answer is: Early airships such as zeppelins were filled with hydrogen, but today's blimps use helium instead.
Have an amazing day and stay hopeful!
Athenian theatre honored mainly Dionysus, god of wine and partying.