Which of the following is true regarding ethers? I. Ethers are not very ... ...

Which of the following is true regarding ethers? I. Ethers are not very reactive. II. Ethers are extremely reactive. III. Ethers are flammable. IV. Ethers have higher boiling points than alcohols.
(A) I & III only
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 25. Ethers