请教一道题

ETS TEST10

34.Scientists belive that by altering the genetic composition of plants it is possible to develop specimens that are resisting to disease and have increased food value.

选B,我一开始选D,觉得应该改成increasing.那么答案是B,是要改成resisted吗?句子读不懂啊~

resisting-resistant

be resistant/adj to sth.

that are....and have

are 和have 都是that 的谓语，平行结构