Read the following article and answer the question. Article: Sales of electric bicycles, or e-bikes, a hot item in consumer green tech, are expected to grow by more than 50% in North America during 2013. Actor William Shatner, who is no stranger to futuristic tech, recently purchased two e-bikes for him and his wife. I've been shopping for an e-bike now for a few weeks, and I've had my eye on the folding electric bike. I've had folding bikes in the past and love the convenience of being able to throw my bike into my car. The e -bike market is ready to go mainstream in the U.S. The price for e-bikes has come down greatly in recent months. At one time, most e-bikes with good components and proper weight were in the $3,000range. Now you can find reasonable quality e-bikes in the $1,000range. With gas prices at all-time highs, e-bikes are an attractive, low-cost option to gas efficient vehicles. E-bike owners are finding that they are great for commuting to work, as traditional bikes can be a problem with office dress and sweat. People who use e-bikes range from commuters to casual cyclers who like a little help with hills and wind,to those who decided to save money on buying a motor bike.These are not for the serious road cycler or professional mountain biker. If you're considering all e--bike, it pays to do some research first.Cheaper e-bikes are going to be heavier and have less battery--power.Higher priced bikes will be made from lighter materials and have better batteries. Another consideration is local motor vehicle laws.For example,according to US federal law,as long as your electric bike is under 750 watts and does not go over 20 MPH then it is a bicycle and not a motor vehicle.Most consumer e--bikes in the $1,000 range don't fit the motorized vehicle description. Question: The writer introduces William Shatner as an example in order to _ . Answer:

Select from:
[+] show that he is wild about the future technology
[+] tell us that he is an agent for the e--bike market
[+] tell us that actors care only convenience no the price
[+] show that e-bikes are really becoming popular now
Answer:
show that e-bikes are really becoming popular now