I disagree with the previous posters. The choice is between D and E but I think E is the correct choice.

**Quote:**

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

the sentence continues with "a numerically schooled young orangutan". Therefore, it seems as if the young orangutan would flash the numerals and cover the numbers. This isn't the case to my understanding because a human will conduct these tasks. Hence, D is incorrect.

**Quote:**

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

This might look weird on the first look but it isn't. I think that the author directly speaks to the reader. It is a direct request to the reader. If we keep this in mind it all make sense. If we add "you" to the beginning of the answer choice it would look like this:

"[...] is astonishing: You flash a random scattering of numerals on a screen for half a second then cover the numbers with white squares and a numerically schooled young orangutan will touch the squares sequentially to indicate the ascending order of the numbers hidden beneath"

Let me know what you think

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