Cats have excellent night vision, sharp hearing and enormous physical strength. They sneak up on their prey; the camouflage patterns in their fur and their graceful, subtle movements ---3--- the cats difficult to detect. Look at the blank with the number 3 in the passage. Which of these answers correctly completes the sentence? A) make B) makes C) had made D) have made.

B

Explanation:

because none of the others could fit and make sense

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