Question

There is undoubtedly ________ element of mystery about the house

Answer 1

Yo!

Here's the answer!

There is undoubtedly AN element of mystery about the house.

Why ''AN'', and not any other preposition?

Because,whenever there are words,starting with vowels such as:A,E,I,O,U;it's mandatory to use "an" before them.

Hope it helps!

-TGA.

Answer 2

Hello Bittu :D

(And Neer) And brainly mates XD

So in accordance to rule of Articles ..A,E,I,O,U

Words beginning with vowels have "an" in their beginning .

Similarly, the answers is..

There is undoubtedly an element of mystery about the house.(I am sorry I don't know which element resides in that house not a vampire for sure xD)