Answer:
A). The youth group members are baking cookies tonight. They plan to sell them at a bake sale to raise money for the local food bank.
B). The youth group members are baking cookies tonight; they plan to sell them at a bake sale to raise money for the local food bank.
Step-by-step explanation:
The given passage contains punctuation error and the options that best revise the passage in an effective manner would be options A and B as they are appropriately punctuated and conveys the meaning or essence of the passage comprehensively. The first option separates the idea into two parts by using full stop(.) after the first sentence to clarify the intended idea while the option B employs a semicolon(;) to demarcate the two ideas evidently.
The other two options are inapplicable as they contain punctuation errors like the original sentence which messes up the entire idea conveyed in the passage in option C and in option D, the incorrect use of full stop(.) prior to prepositional phrase disconnects the thought. Therefore, options A and B are correct.