Aniko
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Question 40·Medium·Standard English Conventions

The award-winning photographer Ana Flores is known for capturing intimate portraits of wildlife in Patagonia. While hiking through the region’s rugged terrain, Flores often spends hours waiting quietly for a puma to appear, her camera resting on a lightweight tripod until ______ ready to take the shot.

Which choice completes the text so that it conforms to the conventions of Standard English?