What Is the Maximum Angular Resolution (Sharpness of the Image)

Multiple Choice

What is the maximum angular resolution (sharpness of the image) obtainable with radio telescopes on Earth?

A) 0.00001 arcsecond using the worldwide very long-baseline interferometry (VLBI) array of telescopes
B) 100 arcseconds using the 305-m Arecibo telescope in Puerto Rico
C) 0.0001 arcsecond using the very long-baseline array of telescopes extending across the United States and including Hawaii
D) 0.1 arcsecond using the 27-dish very large-array (VLA) of radio telescopes at Socorro, New Mexico