Rearrange the sentences to make meaningful sentences

held/ is/ festival/ attend/ mountainous/ Although/ it/ people/ in/ many/ a/ the.

A. Although held the festival is in a mountainous area, many people attend it.

B. Although the festival is held it in a, many people attend mountainous area.

C. Although the festival is held in a mountainous area, many people attend it.

D. Although the festival is held many people in a mountainous area, attend it.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. addition

B. advantage

C. adventure

D. advertise

Amin đơn chức X có chứa vòng benzen. Cho X tác dụng với HCl dư thu được muối Y có công thức RNH₃Cl. Cho a gam Y tác dụng với AgNO₃ dư thu được a gam kết tủa. Hãy cho biết X có bao nhiêu đồng phân

A. 6

B. 5

C. 4

D. 3