|Question 17Verbal

Source Texts

Text
Between June 22 and July 2 each year, particles shed by comet 7P/Pons-Winnecke enter Earth's atmosphere at a velocity of 18 kilometers per second. Relatively few of these particles are likely to reach Earth's        since the meteoroids' compression of the air surrounding them causes the vast majority to burn up in the mesosphere, producing the June Boötid meteor shower.
Which choice completes the text so that it conforms to the conventions of Standard English?
surface, however;
A
surface, however,
B
surface: however,
C
surface. However,
D