What is the common difference in the following arithmetic sequence? 2.8, 4.4, 6, 7.6, ...

Subtract consecutive terms to find the common difference: 4.4 − 2.8 = 1.6. Checking the next pair gives 6 − 4.4 = 1.6, so the difference is consistent. The common difference is 1.6, choice C.

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