The correct order of $d_{\mathbf{C}-\mathrm{H}}$ in the following option is :

As number of $\text{ F }\uparrow ,\mathrm{\%}\text{ s-character in }\mathrm{C}-\mathrm{H}\text{ bond }\uparrow$.

Hence, $\mathrm{C}-\mathrm{H}B,\mathrm{L}\downarrow$.

So, the correct answer is ${\mathrm{CH}}_3\mathrm{F}>{\mathrm{CH}}_2{\mathrm{F}}_2>{\mathrm{CHF}}_3$.
Hence, the correct answer is D.