Answer:
The word that best connects the ideas in the sentences above is "unfortunately". (B).
Step-by-step explanation:
"Unfortunately" is the best option to connect the sentences. The first sentence refers to an event that may take place in the near future. Yet, the second sentence states that this event can't take place because of a particular reason. Consequently, "unfortunately" is the best option because this adverb is used to say that something is bad, disappointing, or has a bad a effect. "Therefore" is used to indicate consequence, "in contrast" to talk about a statement that contradicts with what has just been said, and "nowadays" to make a statement about the present time. Still, the original sentence refers to the near future (2020).