Answer:
All answers are correct.
Step-by-step explanation:
Both reasons given as to why the statement has a weak transition are correct. The first reason is correct because even though there is a transition between ideas, it is not so explicit. It does not form a continuous stream of logical argument. The use of 'this' blurs the main point that the writer is trying to correlate with another.
The second sentence is also right because there is really no point putting the 'thesis' there. The speaker should have simply made his point, and in the same sentence line. The reader already knows that this is a thesis, so there is no point spelling it out again.