Multiple choice softskills communication

I cannot understand why she did that, it really doesn't add up.

  1. doesn't calculate

  2. doesn't make sense

  3. isn't mathematics

  4. makes the wrong addition
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The idiom 'add up' means to make sense or be logical. The speaker cannot understand why someone did something because it doesn't make logical sense. 'Doesn't calculate' is too literal, 'isn't mathematics' misses the figurative meaning, and 'makes the wrong addition' incorrectly focuses on arithmetic.

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