The answer is A.
The subject of the sentence (the person or thing doing the action) has to agree in number with the verb (the word representing the action).
Answer:
C
Explanation:
Both B and D use "publish" instead of published which is not on the correct tense, so we can rule those out. Then, I looked for another error, and you need an a before "patent clerk." So A, the other viable answer, was ruled out. C is correct.
Positive: Gaze
Negative: glare,