What do scientists use to determine what the interior of a moon is like?
a. soil cores
c. densitometers
b. x-rays
d. spacecraft navigation data

(D) Space craft navigation data

Explanation:

 The scientist used to determine the interior of the moon by using the data given by spacecraft navigation. The spacecraft navigation data is basically used for determine the various types of velocity and the position of the space objects.

 We can also estimate the orbital position of various types of space object by using the specific space navigation data. It is used for making the higher-devotion reconstruction of the craft's direction for the future course remedies and also for the operational and scientific purposes.

Therefore, Option (D) is correct.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.