Which answer choice has 4 significant figures ... A. 100.090090 b. 143.29 c. 0.05843 D. 0.1000 E. 00.0030020

c. 0.05843 would be the correct answer.

This is because significant figures are measured by starting from the first non-zero digit, and the first non-zero digit in option c. is 5, and it ends at 3. If you count all the figures from 5 through 3, you'll find that there's 4 figures in total (5, 8, 4, 3).