Modifying phrases vs. relative pronouns : an example

sudipto wrote:The regents of the University of California system have recently acted on plans to add two new universities, which increases to ten the number of U.C. schools.

(B) universities which increase the number to ten

which incorrectly refers to two new universities and also increaseS is using a singular form


(C) universities, increasing to ten the number

increasing correctly modifies the previous sentence and also showing a casual relationship


(D) universities, a plan which will have increased to ten the number

Using an absolute phrase did not correct the sentence because plan itself did not increase to ten


(E) universities to increase to ten the number

Awkward - I am not really sure what is wrong here