Identify the segment that contains a grammatical error.
By this time next year / I will had graduated from college / and starting my first job / in the field of marketing.

Correct option is D

Option (d) contains the grammatical error.
Correct sentence: "I will have graduated from college."
Explanation:
· The phrase "will had" is incorrect because "will" is always followed by the base form of the verb, not a past form like "had."
· The correct auxiliary verb is "have."
· The correct future perfect tense structure is: Subject + will + have + past participle.
Example: By this time next year, I will have completed my training.
Grammatical Rule Used:
· Future perfect tense is used to describe an action that will be completed by a specific point in the future.