A Trip to the Market: How to Talk about Weights in Mandarin

Please choose the correct answer to fill in the blank.
Gùkè: Lǎobǎn, píngguǒ duōshao qián yì ___?
顾客：老板，         苹果         多少         钱   一 ___？
Customer: How much are the apples?
Lǎobǎn: Wǔkuài.
老板：      5块。
Storekeeper: Five Yuan.
Please choose the correct answer to fill in the blank.
A. 吨(dūn)

B. 斤(jīn)

C. 克(kè)