The sentence below has been divided into four parts. One of these parts may contain an error. Select the part that contains the error.

The architect was oblivious (A)/ to the fact that her team had (B)/ already finalized the blueprints (C)/ before she arrive at the venue. (D)/ No error

The correct option is D.

Explanation:
The given sentence is set in the past tense, as indicated by the past auxiliary verb "was" in part (A) and the past perfect phrase "had already finalized" in part (C).
To maintain sequence of tenses and grammatical consistency throughout the past context, the simple past tense form "arrived" should be used instead of the present simple tense form "arrive" in part (D).

Correct Sentence:
"The architect was oblivious to the fact that her team had already finalized the blueprints before she arrived at the venue."