The given statement is an example of a phrase, specifically, a participial phrase. The element that is necessary to complete the sentence is an independent clause. A participial phrase consists of words with the -ing or -en form plus its modifiers. This kind of phrase always functions as an adjective. The phrase "Beginning in the fall of 1957" is describing a certain noun, which is found in the independent clause.
I believe that the correct answer is D because it is already stated once that they need the sirens so it is giving us a fact that has already been stated.
Superlative degrees are forms of the base adjectives that are defined as the highest kind or order of the adjective when more than two objects are compared from one another.Say for example, beautiful, the superlative form is most beautiful. In this case, the words of superlative degree are absolute, wealthy and smart.
The difference between wakeboarding and snowboarding is in snowboarding you steer with your back foot. It will take some getting used to, but generally, lean on your front foot and you swing your back foot to change edges.
