=> B Although my grandfather is old, he can jog in the park every evening.

Although S V, S V: mặc dù -> loại D

Despite/In spite of N/Ving: mặc dù

A và C sai vì không hợp nghĩa (nghĩa chung chung là mặc dù ông tôi già -> ông ấy có thể chạy bộ trong công viên mỗi sáng)

My grandfather is old, but he can jog in the park every evening

A. Despite my grandfather's old age, he can't jog in the park every evening

B. Although my grandfather is old, he can jog in the park every evening

C. In spit of being old, my grandfather can't jog in the park every evening

D. Although my grandfather is old, but he can jog in the park every evening

⇒D sai vì although vế sau không dùng  but

⇒A và C  sai  nghĩa can't là  sửa lại can không not

@xin hay nhất ạ