Here are the comparisons for the word pairs:
aprender / enseñar - c. tan importante como
una ventana / un lápiz - a. más grande que
un café / una pizza - b. menos rico que
Rafael Tufiño / yo - d. más artístico que
aprender / enseñar - c. tan importante como
The comparison here suggests that learning and teaching are equally important.
una ventana / un lápiz - a. más grande que. This comparison indicates that a window is larger than a pencil.
un café / una pizza - b. menos rico que. This comparison implies that coffee is less rich (in flavor or ingredients) than pizza.
Rafael Tufiño / yo - d. más artístico que. This comparison suggests that Rafael Tufiño is more artistic than yourself (assuming "yo" refers to you). It implies that Tufiño has a higher level of artistic skill or creativity.