The answer is, "London's Heathrow International Airport is about to shut down because of the snow, so if the plane doesn't land soon, it will have to go on to Belvedere. "
Explanation:
A)==> In this sentence, we see the use of the proper preposition "so" which shows cause and effect relationship between the two situations discussed here. Punctuation is also placed-in properly to maintain the sense of the statement.
B)==> Punctuation mistakes are present in this statement. For. example: there is comma required between "soon" and "it".
C)==> Here, the separation of the sentence is improper. "because" should not come in the new sentence. It shows inconsistency in the structure of the statement.
D)==> Again, a wrong preposition is utilized to establish a connection in the situations. "But" does not show any effect of the snow on flights deviation in landing.
