Weaken

I am having difficulty understanding how E weakens. Answer choice E states: There are surviving European and East Asian written records from the early Middle Ages that do not mention trade between the two regions but would have been very likely to do so if this trade had existed. I evaluated E as pretty much saying that there could be evidence for only one documentation that did not mention trade between the two regions. But what about the written records that did NOT survive? I thought of these records as a possible majority, and possibly proving the answer choice to be incorrect. Can someone please go into depth with me about how I processed this question incorrectly? Thank you in advance!