Read the following excerpt from the article “Charles Steinmetz: Master of Electricity”:
Steinmetz was as recognizable to the American public as Babe Ruth. He even studied how lightning affected plant growth. More important, his research enabled him to test and improve lighting arrestors that would safeguard the power grid and make electricity reliable. (paragraph 18)
Based on the context, what does the word enabled most likely mean?
promoted
frustrated
allowed
prevented