Hi there!
In any kind of formal writing, the writer should be sure to use a formal language.
Using a formal language, not using slang or including swear words, is a crucial part of being a formal writer. A formal piece of writing also needs proper formatting, layouts, punctuation, grammar (and all that good stuff you learned in your early days).
Not only does this make your piece look more professional, it attracts the audience and gains trust from them.
Hope this helps!
B. is the answer. "Until I get a replacement for my broken cellular phone I will not be able to call you on my way home."
P.S. the answer C. had way too amny comma's in all the wrong places.
Answer:
Calculate the speed of a wave that has a wavelength of 8 meters and a frequency of 16 meters per second (m/s).