GMAT Sentence Correction (SC) | Re: Beneath the soil of the Malheur National Forest in eastern

Beneath the soil of the Malheur National Forest in eastern Oregon, a fungushas for centuries been slowly weaving its way through the roots of trees, to become the largest living single organism known to humans.

(A) has for centuries been slowly weaving its way through the roots of trees,to become
(B) has slowly woven its way through the roots of trees forcenturies, and so becoming
(C) that has been slowly weaving its way through the roots of trees for centuries has become
(D) that has for