|Question 22Verbal

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While researching a topic, a student has taken the following notes:
- Element abundance is a relative measure of the amount of a chemical element in a given environment.
- Abundance can be expressed as a mass fraction.
- A mass fraction is the ratio of the total mass of an element to the combined mass of all elements in a given environment.
- The mass fraction of oxygen (O) on Earth is 297,000 parts per million (ppm).
- The mass fraction of vanadium (V) on Earth is 105 ppm.
The student wants to specify the total mass of Earth's oxygen relative to that of all elements. Which choice most effectively uses relevant information from the notes to accomplish this goal?
Oxygen's abundance on Earth is greater than vanadium's, as reflected by oxygen's higher mass fraction.
A
Oxygen's abundance can be expressed by a mass fraction, a measure of the element's mass relative to that of all elements on Earth.
B
At 297,000 ppm, oxygen's mass relative to the combined mass of all elements on Earth is much higher than vanadium's.
C
Oxygen's mass relative to the combined mass of all elements on Earth is 105 ppm.
D