Because i am very interested in the position you have available at your company, would like to schedule an interview with you.

what is wrong with the sentence?
a. the sentence contains several spelling mistakes.
b. the sentence is grammatically incorrect.
c. the sentence uses an unprofessional tone.
d. the sentence uses an informal style.

In my persepctive i'd like to believe its B. It seems to be not talking in the way of a true job interveiw. Also there is gramarr mistakes which is what the option B suggests

For example a better way of saying this would be-
Due to me being  interested in the position you have available at your company, I would like to schedule an interview with you whenever you have time. 

Also the way they started it off proves its inccorect in grammar
... After careful thinking I believe you should go with B. It has more proof and confirmation from 2 other users:)

HOPE THIS HELPS