Which sequence shows a substitution mutation of a section of this dna?

I took a chance with the answer given by Madison0000006.

It is correct.  For those who want to know what the options were?

A.  A-C-T-G-G-T

B.  A-C-T-G-G-A

C.  A-C-G-G-A-T

D.  A-C-T-G-C-G-A-T

Explanation:

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek