答案：C
意思：自从采用这些技术以来，没有出现一例通过血浆产品传播艾滋病毒或肝炎的案例。
解析：
A. transaction a piece of business that is done between people(一笔)交易，业务，买卖
Neither side would disclose details of the transaction.双方都不会透露交易的细节。
B. transition the process or a period of changing from one state or condition to another 过渡;转变;
The transition from school to work can be difficult.从在学校念书到上班工作，这一转变有时候可真不容易。
C. transmission the act or process of passing sth from one person, place or thing to another 传送;传递;传达;传播;传染
Heterosexual contact is responsible for the bulk of HIVtransmission异性间的性接触是造成大多数艾滋病病毒传播的原因。
D. transformation a complete change in sb/sth (彻底的)变化，改观，转变，改革
The way in which we work has undergone a complete transformation in the past decade.在过去的十年里，我们的工作方式经历了彻底的变革。
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