Choose the option which best expresses the meaning of the given word.
LUMINARY
a) Bright
b) Lightning
c) Dignitary
d) Dashing

Hint:A ‘luminary’ is a person who inspires or influences others, someone who is eminent in some way. So, we need to find the word that matches or best describes this description.

Complete answer:
First, let us go through the option that we have at hand and try to understand what they mean. That way we'll find the best possible solution for the word ‘luminary’.
So, what does luminary mean?
Well, luminary refers to a person who inspires or influences others. Now, let us go into the options that we have –
Option ‘a’ – bright means giving out or reflecting much light, or someone who is intelligent and quick – witted.
Option ‘b’ – lightning means the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud.
Option ‘c’ – dignitary means a person who is considered to be important because s/he holds a higher rank or office.
Option ‘d’ – dashing means someone who is attractive, handsome and full of confidence.
Here, you can see that the word that shares some resemblance in meaning with ‘luminary’ is – dignitary. This implies that the correct option is – option ‘c’, i.e. dignitary.
Also, you can tell by the meanings explained that no other word comes close to the meaning that luminary h=expresses.

Note:
The word luminary has nothing to do with light or brightness here even if the word ‘lumin’ is light derived from the Latin word.