单选题 Which of the following prepositional phrases is an adverbial of concession?

A、 With all his boasting, Robert achieved very little.
B、 Firebricks (耐火砖) are used with the object of minimizing heat losses in the boiler(锅炉).
C、 She fell down the stairs with all her shopping.
D、 He sewed on the button with considerable awkwardness.

【正确答案】 A

【答案解析】句子成分。B项为with引出的目的状语；C项为with引出的伴随状语；D项为with引出的方式状语。A项with引导的介词短语充当让步状语。