Identify the segment that contains an incorrect preposition.
I am writing to invite you / to give a presentation / for our Jobs and Careers Conference / for engineering graduates.

Correct option is C

Explanation:
The correct preposition should be "at" instead of "for".
"At our Jobs and Careers Conference" is the correct phrase.
(a) for engineering graduates – Correct; "for" is appropriate for a target group.
(b) I am writing to invite you – Correct; "to invite" is correctly used.
(d) to give a presentation – Correct; "to" correctly introduces the action.
Grammar Rule:
· Use "at" for events or locations.
· Example: She spoke at the seminar.