Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters / number of consonants / vowels in the word.)

Shield : Guard :: Spanner : ?

Grip

Shield : Guard :: Spanner : ?

The  logic followed here is :

SHIELD IS A LARGE PIECE OF METAL OR WOOD THAT SOLDIERS CARRIED TO GUARD THEMSELVES

SIMILARLY

SPANNER IS A METAL TOOL WITH AN END SHAPED FOR TURNING SMALL METAL RINGS  AND PINS  THAT ARE USED TO GRIP THINGS TOGETHER