Question

which answer choice does not have any grammar or usage mistakes?
the astronomer, whose received an invitation to present his findings at next months conference, recently won an award for his research. he was thrilled to receive the honor, but humbly stated that he couldnt have accomplished so much without his valuable team.
the astronomer, whom received an invitation to present his findings at next months conference, recently won an award for his research. he was thrilled to receive the honor, but humbly stated that they couldnt have accomplished so much without his valuable team.
the astronomer, who received an invitation to present his findings at next months conference, recently won an award for his research. he was thrilled to receive the honor, but humbly stated that he couldnt have accomplished so much without his valuable team.
the astronomer, who received an invitation to present his findings at next months conference, recently won an award for his research. he was thrilled to receive it, but humbly stated that he couldnt have accomplished so much without their valuable team.

Explanation:

1. First option: Uses "whose" (possessive pronoun) incorrectly as a subject relative pronoun; should be "who".
2. Second option: Uses "whom" (object pronoun) incorrectly as a subject relative pronoun, and uses "they" which does not agree with the singular antecedent "the astronomer".
3. Third option: Uses the correct subject relative pronoun "who", maintains consistent singular pronoun "he" referring to the astronomer, and has no grammar/usage errors.
4. Fourth option: Uses "their" which does not agree with the singular antecedent "the astronomer".

Answer:

The astronomer, who received an invitation to present his findings at next month's conference, recently won an award for his research. He was thrilled to receive the honor, but humbly stated that he couldn't have accomplished so much without his valuable team.