Question

7 choose the answer that best completes the sentence below. 3d printers are being used to improve peoples lives, ______, medical devices like hearing aids and replacement limbs are being 3d - printed. a for example b however c eventually d even though

Explanation:

The first part of the sentence states that 3D printers are used to improve lives, and the second part gives an example (medical devices like hearing aids and replacement limbs being 3D - printed) to support the first statement. "For example" is used to introduce an example, "However" is for contrast, "Eventually" is about time, and "Even though" is for a contrasting condition. So "For example" fits best.

Answer:

A. For example