Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

In the cellphone market, investors notice that if the price of the cellphone increases 10%, the quantity demand for thecellphone will fall 40%. The price elasticityofthe cell phone is:
Option A:-0.25.
Option B:-4.0.
Option C:-0.04.

Answer: B