The value of $$14 - 20 \times [7 - \left\{18 \div 2  \text{of}   3 - (15 - 25 \div 5 \times 4)\right\}]$$ is:

$$14 - 20 \times [7 - \left\{18 \div 2  \text{of}  3 - (15 - 25 \div 5 \times 4)\right\}]$$

= $$14-20\times[7-\left\{18\div2  \text{of}  3-(15-5\times4)\right\}]$$

= $$14-20\times[7-\left\{18\div2  \text{of}  3-(15-20)\right\}]$$

= $$14-20\times[7-\left\{18\div2  \text{of}  3+5\right\}]$$

= $$14-20\times[7-\left\{18\div6+5\right\}]$$

= $$14-20\times[7-\left\{3+5\right\}]$$

= $$14-20\times[7-8]$$

= $$14-20\times[-1]$$

= $$14+20$$

= $$34$$

Hence, the correct answer is Option D