Here is the GMAT practice question for this week. It is kindly provided by Veritas Prep.

Sentence Correction:

The numeric working memory of young orangutans are astonishing: flashing a random scattering of numerals on a screen for half a second and then covering the numbers with white squares, a numerically schooled young orangutan will touch the squares sequentially to indicate the ascending order of the numbers hidden beneath.

A) are astonishing: flashing a random scattering of numerals on a screen for half a second and then covering the numbers with white squares,

B) are astonishing: flash a random scattering of numerals on a screen for half a second and then cover the numbers with white squares,

C) are astonishing: flash a random scattering of numerals on a screen for half a second and then cover the numbers with white squares, and

D) is astonishing: flashing a random scattering of numerals on a screen for half a second and then covering the numbers with white squares,

E) is astonishing: flash a random scattering of numerals on a screen for half a second and then cover the numbers with white squares, and

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Photo/Primate Research Institute of Kyoto University