Which best explains what happens when an electron moves from an excited state to the ground state?

a)the electron absorbs energy as it moves to a lower energy level.
b)the electron absorbs energy as it moves to a higher energy level.
c)the electron releases energy as it moves to a higher energy level.
d)the electron releases energy as it moves to a lower energy level.

It's D, when an electron moves lower, it emits light energy.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.