Two satellites $A$ and $B$ are revolving around the earth in orbits of heights $1.25 R_E$ and $19.25 R_E$ from the surface of earth respectively, where $R_E$ is the radius of the earth. The ratio of the orbital speeds of the satellites $A$ and $B$ is

• A

  $5: 1$
• B

  $4: 1$
• C

  $9: 1$
• Correct answer
  D

  $3: 1$

Hence, the correct answer is option: 'D'.