Correct option is CConcept Used:Solution:12÷34 of 5612÷34×56+2+2×22÷2×2=12÷5812×43×56+2+41×2=4559+62=45×95+3=3625+3=3625+7525=11125\frac{\frac{1}{2} \div \frac{3}{4} \, \text{of} \, \frac{5}{6}}{\frac{1}{2} \div \frac{3}{4} \times \frac{5}{6}} + \frac{2 + 2 \times 2}{2 \div 2 \times 2} \\= \frac{\frac{1}{2} \div \frac{5}{8}}{\frac{1}{2} \times \frac{4}{3} \times \frac{5}{6}} + \frac{2 + 4}{1 \times 2} \\= \frac{\frac{4}{5}}{\frac{5}{9}} + \frac{6}{2} \\= \frac{4}{5} \times \frac{9}{5} + 3 \\= \frac{36}{25} + 3 \\= \frac{36}{25} + \frac{75}{25} \\= \frac{111}{25}21÷43×6521÷43of65+2÷2×22+2×2=21×34×6521÷85+1×22+4=9554+26=54×59+3=2536+3=2536+2575=25111