The group of words that best helps the reader understand the meaning of the word "limitations" in the provided sentence is "but the idea has limitations, as well."
This phrase informs the reader that, despite the strengths of the argument, there are restrictions or drawbacks to consider, highlighting the contrast and contextualizing "limitations." However, if you're looking for the option from the provided ones, "There are many strengths" also indicates that while there are positives, there are also constraints because those strengths are not all-encompassing. If your choices need to come strictly from the given options, the best fit would be:
There are many strengths.
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