Which of the following fractions are in descending order?

$$\frac{5}{8}, \frac{7}{12}, \frac{3}{4}, \frac{13}{16}$$

take LCM to make the denominator of each fraction same

LCM of (8,12,4,16)=48

option A wrong

$$\frac{30}{48}> \frac{28}{48}<\frac{36}{48}< \frac{39}{48}$$

option B wrong

$$\frac{28}{48}< \frac{39}{48}> \frac{36}{48}>\frac{30}{48}$$

option C wrong

$$\frac{30}{48}>\frac{28}{48}< \frac{39}{48}>\frac{36}{48}$$

option D right

$$\frac{39}{48}>\frac{36}{48}> \frac{30}{48}>\frac{28}{48}$$