Which of the following words is closest in meaning to “Interpolate”?

Interpolate means to insert something into a text or series.

• Correct answer - insert: it has the same meaning as Interpolate.
• elaborate: to add detail - wrong, it does not mean the same as Interpolate.
• reverse: to turn the other way round - wrong, it does not mean the same as Interpolate.
• mix: to combine - wrong, it does not mean the same as Interpolate.