An Astronomer Is Trying to Detect an Exoplanet Via the Microlensing

Multiple Choice

An astronomer is trying to detect an exoplanet via the microlensing method. Which of these changes to a particular planet will make it easier to detect, if everything else about the planet is unchanged?

A) increasing its radius
B) increasing its mass
C) increasing its orbital period
D) All of these are correct.