chocolate is my achilles heel this is example of alliteration.
Explanation:
A group of similar things or people positioned or occurring closely together
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!
Its a decigram. if it were meter, then it would therefore be decimeter,