Respuesta :
correct, it's A!
A participle is a form of a verb (here our verb is "to round" and this form is rounding), most typically with the ending -ing or -ed. And a participle phrase is the one containign this word!
A participle is a form of a verb (here our verb is "to round" and this form is rounding), most typically with the ending -ing or -ed. And a participle phrase is the one containign this word!