Ancient egyptian astronomers studied the stars to

predict the flooding of the nile river
create new medicines from plants
appoint the next pharaoh
create a new writing system

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

i would say your answer is a)

sorry if im wrong

what are the choices btw if it was me id say the lack of money to continue with education