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 sentence.
He was not convicted. There was no sufficient proof against him.
1) while
2) as well as
3) as
1
Only 1
2
Only 2
3
Only 3
4
Both 1 and 2
5
Both 1 and 3