<span>a.) a long supporting arm
In this case the word boom is used as a noun, something you can touch - or in this case move. This eliminates D as an option. When looking at the adjective (microphone) describing the type of boom, the other options can be eliminated as well. A boom on a sailboat is the supporting arm that swings the sail from one side of the mast to the other to help the boat catch the wind.
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How are people supposed to answer this if you didn’t even put the paragraph
factors that describe a coniferous forest are:
a.it is also called a 'TAIGA'
b. these forests provide soft wood
last but not the least.....
c. soft wood is used for making pulp from which paper is made