Answer:
A- Corn prices have more than doubled since 2005 because of increased demand, according to financial experts.
Step-by-step explanation:
A fact should be cited where it is picked from for its validation. And from all 4 of the statements, the 1st statement is asserting strongly that demand was increased in 2005 so we know it's the fact. Moreover, another detail to prove that it's a fact is that this statement wasn't of the author himself he picked it from other financial experts.