Select the phrase/connector from the three options that can be used to form a single sentence from the two sentences below, implying the same as expressed in the statement sentence.
The company needs to invest more heavily in research and development. They need to improve their manufacturing facilities.
1. Because
2. Yet
3. But
1
Only 1
2
Only 2
3
Only 3
4
Both 1 and 2
5
Both 2 and 3