Question

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unit test:
change and growth - part 1
which of the following did benjamin franklin invent or develop?
swivel chair, carnage, and the u.s. treasury
electricity, postage stamps, and the printing press
lightning rod, mousetrap, and the fountain pen
bifocal eyeglasses, a clean-burning stove, and the u.s. postal system

Explanation:

To solve this, we analyze each option:

• First option: Swivel chair (invented by Thomas Jefferson), carnage (not an invention), U.S. treasury (not invented by Franklin) → incorrect.
• Second option: Electricity was discovered, not invented by Franklin; printing press (invented by Gutenberg) → incorrect.
• Third option: Mousetrap (not Franklin's), fountain pen (not his) → incorrect.
• Fourth option: Franklin invented bifocal eyeglasses, developed a clean - burning stove (Franklin stove), and helped establish the U.S. postal system.

Answer:

D. bifocal eyeglasses, a clean - burning stove, and the U.S. postal system