Johann gutenberg's invention was the a. crossbow b. printing press c. microscope or d. telescope

Johann Gutenberg's invention was the printing press. Option B would be your best answer.

Explanation:

What makes the other answers incorrect:

The crossbow was made by the Chinese way before Gutenberg's time.

Zacharias Janssen is credited for the microscope.

Hans Lippershey is credited for the telescope.

I Hope this helps.

answer; /// i believe that the correct answer is (b)///they gained vast amounts of

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.