Write the next sentence in the following story.

How to deal with bedbugs
Learn how to kill bedbugs.
Use rubbing alcohol or water and detergent applied from a good, big spray bottle. The spray bottles from home improvement and department stores are adequate.

Available choices:
[a]. If you really want to spray a new bedbug, invest in a wide assortment of repellents that will repel bedbugs. Purchase a particular insect insect repellent : There are a number of insect repellent brands available in your area that you can use on bedbugs.;
[b]. It's not necessary to use a fresh microfiber cloth this time as you won't dry sticky or powdery dust away quickly. The chemicals that kills bedbugs aren't necessarily formulated to destroy bedbugs-they work as spores and are found in moisture-soaked carpeting.;
[c]. These tests are often inconclusive because there is no evidence of how to fully eradicate bedbugs from the house. Instead, look for any confused behavior or inability to act normally.;
[d]. A better buy would be to use used and higher quality spray bottles for laundry pre-treatment, glass cleaners, car interior cleaners etc. Alcohol-buy several large bottles of 70% rubbing alcohol and mix them with water at no less than 50% strength.;. The answer should be
[d].