SPLIT1) "MAY BE SO BRISK THAT" => "SO THAT" => CORRECT IDIOM => IS THE CORRECT IDIOM. A AND E ARE OUT.
SPLIT2) "ABILITY TO" IS ALSO THE CORRECT IDIOM. IN THIS CASE THERE IS A CAVEAT LOOK AT THE ANSWERS YOU WILL FIND "ABILITY OF(PREPOSITION)…..FOR" AND "ABILITY OF(PREPOSITION)…TO" SO YOU NEED TO BLOCK THE NOISE OF THE PREPOSITION "OF SOME CHILDREN" AND FOCUS ON "ABILITY TO". A AND E ARE OUT.
SPLIT3) "TO DISTINGUISH"
...
SPLIT2) "ABILITY TO" IS ALSO THE CORRECT IDIOM. IN THIS CASE THERE IS A CAVEAT LOOK AT THE ANSWERS YOU WILL FIND "ABILITY OF(PREPOSITION)…..FOR" AND "ABILITY OF(PREPOSITION)…TO" SO YOU NEED TO BLOCK THE NOISE OF THE PREPOSITION "OF SOME CHILDREN" AND FOCUS ON "ABILITY TO". A AND E ARE OUT.
SPLIT3) "TO DISTINGUISH"
...

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