Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the same as expressed in the statement sentences.
The lack of appreciation of the unseen benefits of forests. Biodiversity-rich areas have been opened for mining.
1. is a reason why
2. is too common for
3. has been responsible
1
Only 1
2
Only 2
3
Only 3
4
Both 2 and 3
5
None of these