Zane is writing a problem and solution essay about the giant African land snail. His current thesis statement reads:

While it has never been proven, some believe that giant African land snails are capable of eating small rodents and birds.

What makes his thesis statement ineffective?

It does not state the author's ideas about the topic in one sentence.
It is written in first-person point of view.
The ideas present cannot be supported by valid research.
There is no issue with this thesis statemen