GMAT Sentence Correction (SC) | Re: Regardless of their form or function, all aerodynamically

Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788, when Europeans saw Dharug-peaking men tossing “bumariny” in the area later known as Sydney.

A. Regardless of their form or function, all aerodynamically enhanced, curved objects made for throwing have been called boomerangs by non-Australians even since 1788,Number mentioned is right (Their- Curved Objects- have been). Secondly 'When in the non-underlined portion must modify time mentioned closest to it- And it is modifying 1788