Which passage is the best example of deductive reasoning?

Deductive reasoning is also known as logical deduction, is basically the process of thinking about something in a logical way, going from general concepts known to be true to get a specific conclusions or judgments and thus constructing a sound argument.

Thereby the best example is (A.), since "Anna must have a degree" was concluded as a deduction from the previous 2 general statements.

Explanation:

i   believe   the   answer   is   d

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,