Is the following statement a good definition? why?

a cat is an animal with whiskers.

(a). it is not. the statement is not precise.
(b). it is not, the statement is not reversible.
(c). it is because all cats have whiskers.
(d). it is. the statement is precise and reversible.

Which words and phrases connect the ideas in this excerpt from a compare and contrast essay? the team considered using products made by company a and company b. however, the budget and concerns about learning about two products meant that they needed to choose only one. they realized that the product from company a was of excellent quality, to company b's product.