Not sure what this means in a certain context
Pandapani12
Hi everyone, I have another vocabulary question.
Astronautics owes much to the \_\_\_ contributions of Charles E. Whitsett. His ground-brekaing development of the manned maneuvering unit enabled the first spacewalks in which astronauts were not tethered to a spacecraft.
A. Dubious
B. futile
c. galvanizing
d. avant-garde
How is the answer avant-garde? I got the answer through process of elimination, but is there a better way to get it? Thank you so much!