Discussion
What is the proportion of the frequency of occurrence of La Nina compared to El Nino ?
Answer: A
The keyed answer is Half, option A: La Nina occurs about half as often as El Nino. The two are the opposite phases of the El Nino Southern Oscillation, and El Nino, the warm phase, is the more frequent of the two in the records, so the La Nina is the less frequent.
Twice (option C) reverses the proportion. One-third (option B) and two-third (option D) are other fractions that the key does not accept. I could not find a published source that gives the exact ratio, so the answer follows the official key.
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