In the given question, a sentence is given with a part of it missing and represented by a blank. Choose the phrase that can be placed in the given blank to make a meaningful and grammatically correct sentence.
No curative treatment has been identified and the search for modifiable risk and protective factors remains ___________.
1
an objectionable thing
2
a threat to humanity
3
a public health priority.
4
a conspiring thing
5
None of these