Question must be answered based on the following sentence.

Sony has invested millions of dollars in the development of Blu-Ray technology. The success of Blu-Ray is therefore vital for the company’s future.

Adapted from: ESTERAS, Santiago Remacha. Infotech: English for computer users (4th ed.). Cambridge University Press. 2008.

In the sentence above, the word “therefore” can be replaced, while maintaining the semantic value and preserving the logical relationship between the two clauses, by: