Fill in the blank with the correct alternative:
Someone has defined genius as an infinite capacity __________ learning.
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When dealing with expressions like "capacity for," be sure to use the appropriate preposition. "Capacity for" refers to the ability to engage in something, while other prepositions do not fit in this context.
The correct preposition in this sentence is "for," as it follows the verb "capacity" which is typically used with "for" when referring to an ability or potential. "Off," "from," and "to" would be incorrect in this context.