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Total marbles = 5+3+2=105 + 3 + 2 = 10. Favorable outcomes (blue) = 3. The probability of drawing a blue marble on a single draw is favorable/total = 310\tfrac{3}{10}. Option B is correct. Option A (15\tfrac{1}{5} or 0.20) would be correct if there were 2 blues out of 10 or 1 out of 5—doesn’t match. Option C (25\tfrac{2}{5} or 0.40) overstates the likelihood. Option D (12\tfrac{1}{2}) is far too large given colors are split 5/3/2. On GED probability questions, first count totals accurately, then count favorable outcomes, ensuring you’re answering exactly what is asked (blue, not “not red,” etc.). If the scenario involves multiple draws without replacement, update totals after each draw; here, with one draw, the calculation is straightforward. Converting to decimals (0.30) can help sanity-check: 3 out of 10 feels like “about a third,” which aligns with 0.30.