Analyze the rhyme scheme in these lines from "Sonnet 18"

But thy eternal summer shall not fade, Nor lose possession of that fair thou ow'st, Nor shall dea
th brag thou wander'st in his shade, When in eternal lines to time thou grow'st, So long as men can breathe or eyes can see, So long lives this, and this gives life to thee.

Which is the correct rhyme scheme?

A. abcabc
B. aabbcc
C. ababcc
D. ababab