$2\frac{5}{8}:1,4=\frac{21}{8}:\frac{14}{10}=$ $2\frac{5}{8}:1,4=\frac{21}{8}:\frac{14}{10}=$   $\frac{21}{8}\cdot \frac{10}{14}=$   $\frac{3}{8}\cdot \frac{10}{2}=$   $\frac{3}{8}\cdot 5=\frac{15}{8}=1\frac{7}{8}$  

 

Odp.: A