Question

Which statement BEST conveys the central idea of this encyclopedia article?
A The Moon undergoes several phases which can be seen from Earth.
B The process of waxing and waning are completely different from each other.
C The orbits of the Moon and Earth around the Sun cause very interesting events.
D The Moon reflects the light it receives back to Earth because it doesn't make its own light.
Which two sentences can be added to this encyclopedia article that will further support its central idea?
A Tides of the ocean are created mostly by the magnetic pull of the Moon.
B The amount of light viewers see on the Moon from the Earth changes each day.
C Other planets in our solar system also possess orbiting moons or satellites.
D The phase in between a New Moon and a Full Moon is called a First Quarter Moon.
E Some scientists theorize that the Moon was created from the Earth billions of years ago.
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Answer 1

Best central idea: A

Two sentences to add: B and D

Brief justification: A directly summarizes that the article is about the Moon's phases as seen from Earth. Sentences B (the visible amount of moonlight changes daily) and D (naming a phase between New and Full — First Quarter) both provide details that support and expand that central idea.