Which of the following is most likely the next step in the series? choices: 10a, 21b, 32c, 43d, 54e, 65f. a.66g. b.76g. c.76g. d.66g. e.765. f.7fg

First, we pay attention to the numerical coefficients of the terms in the series: 10, 21, 32, 43, 54, 65. Conclusively they form an arithmetic sequence with a common difference of 11. Thus, the next numerical coefficient is 76. Then, we pay attention to the letters which are just arrange alphabetically. The next letter ought to be G which needs to be capitalized. Thus, the answer is letter C. 76G.