Concept:Significant figures ignore leading zeros, so the first two significant digits here are 4 and 9.Explanation:Write 0.04945 and identify the first two significant figures: 0.04945.Look at the next digit, which is 4.Because 4<5, the second significant figure 9 remains unchanged.Therefore, 0.04945 rounded to two significant figures is 0.049.Answer:0.049 (Option B)