Given data: It is given to find out the nature of the solution.
Concept used: pH =
Explanation: For acidic solutions - pH < 7
For neutral solutions - pH = 7
For basic solutions - pH > 7
= = 1M
& since pH is very less so the solution will be of 1M concentration & is Strongly acidic.
Hence, the correct option is option 2) Strongly acidic.