Question

Up to 80% of doctors endorse this project "uses which rhetorical device"

Answer 1

The correct answer is this one: "A. Euphemism." Up to 80% of doctors endorse this project" uses Euphemism as a  rhetorical device.
Here are the choices.
A. Euphemism
B. Weasel Words
C. Proof Surrogate
D. Innuendo
E. Hyperbole

Answer 2

Answer;

Proof Surrogate.

Explanation;

A claim masquerading as proof or evidence, when no such proof or evidence is actually being offered.

Proof Surrogate is an expression used to suggest that there is evidence for a claim without actually citing any evidence.  For example;

-“Scientists have known that aliens exist for years now.”

-“Everyone knows that bottled water is better for you than tap water.”