Grammar Focus: Using 'Capable' Correctly

This question tests the correct preposition to use after the adjective 'capable'. The phrase 'capable' is typically followed by the preposition 'of' when indicating an ability or potential to do something, especially when followed by a gerund (the '-ing' form of a verb).

Understanding 'Capable of'

The standard idiomatic expression is 'capable of + [noun/gerund]'. This signifies having the power, ability, or fitness to do something.

• Example: He is capable of running a marathon.
• Example: The system is capable of processing large amounts of data.

Applying to the Sentence

In the sentence, "She is capable _______ handling the situation," the word 'handling' is a gerund. Therefore, the correct preposition to link 'capable' with 'handling' is 'of'.

The completed sentence is: She is capable of handling the situation.

Analyzing Other Options

Let's look at why the other options are not suitable:

• Option 2 (in): While 'in' can follow adjectives, 'capable in' is not the standard construction for ability. We might say someone is 'skilled in an area', but not 'capable in doing something'.
• Option 3 (by): The preposition 'by' usually indicates the means or method. It doesn't fit grammatically or idiomatically after 'capable' in this context.
• Option 4 (to): The preposition 'to' often follows adjectives that express willingness or tendency (e.g., 'happy to help', 'likely to succeed'). 'Capable' requires 'of', not 'to', before a gerund expressing ability. We might say someone is capable *of doing* something, not capable *to do* something.

Conclusion

Based on standard English grammar and idiomatic usage, 'of' is the most appropriate preposition to complete the sentence, indicating her ability to handle the situation.