[单选题]
The parallax angles of Star A and Star B are 0.250 ar 6k1.z acy lum5nr(ih:csd) 8zvlnyj n hd:z+9nuer;*c,econds and 0.500 arcseconds respectively. What is the shortest possible distance, in pa*yn+jrn ;dec8hzun z,:)lv d 9rsec, between Star A and Star B?
