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Verbal·Standard English Conventions·Boundaries

hard

Dong Lai and Diego J. Muñoz’s work on circumbinary disk accretion—a process in which, due to gravity, material from an orbiting disk spirals inward and accumulates onto two stars or black holes—relies heavily on simulations. Lai and Muñoz recognize the need for direct __________ recommending evolving binary star systems as a promising avenue for future study.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

observation, however,

B

observation; however,

C

observation. However,

D

observation, however;