D answer is gloomy,meaning to express depression
D. Take it easy would be the best option. You don't want to overwork yourself. That's when you can go into heart arrest.
D. I may be wrong, but that is what I remember in public speaking class
An ambiguous reference means that it's vague, and it leaves the reader unsure. this often occurs when a pronounce is set after two or more subjects that it COULD apply to, but the reader isn't sure. your answer is choice 1.
