Good modifies phone and is a predicate adjective, so a.
<span />
The answer would be : A ) But
-Hope this helps.
The sentence that shows the proper way to use a colon is: Van Gogh painted my two favorite pieces: Starry Night and Sunflowers. The punctuation mark, colon (:) is generally used when introducing a list. But a certain rule is applied when using this punctuation mark. It should not be used if it is directly followed by a verb or preposition.