This question is based on the following paragraph. The sentences are numbered to assist your analysis.
[1] In addition to the risks, there are benefits to using phones on the road. [2] Matt Sundeen, a senior policy specialist for the National Conference of State Legislatures, reports that drivers with cell phones place an estimated 98,000 emergency calls each day and that the phones "often reduce emergency response times and actually save lives" (1). [3] The phones have business benefits too. [4] According to transportation engineer Richard Retting, "Commuter time is no longer just for driving. [5] As the comforts of home and the efficiency of the office creep into the automobile, it is becoming increasingly attractive as a work space" (qtd. in Kilgannon A23). [6] Car phones also have personal benefits. [7] A mother coming home late from work can check in with her children, a partygoer lost in a strange neighborhood can call for directions, or a teenager whose car breaks down can phone home.
In sentences [2] and [4], phrases introducing the sentences are used for the purpose of _______ sources into the composition.
A. integrating
B. drafting
C. dropping
D. generating
