The action of diazomethane on phenol liberates which of the following gases?

The major product in the following reaction is:

Out of the two compounds $A$ ($p$-nitrophenol) and $B$ ($o$-nitrophenol) shown below,the vapour pressure of $B$ at a particular temperature is expected to be:

Phenol,when it first reacts with concentrated sulphuric acid and then concentrated nitric acid,gives:

Which of the following is picric acid?

Given below are two statements.
Statement $I$: Phenols are weakly acidic.
Statement $II$: Therefore they are freely soluble in $NaOH$ solution and are weaker acids than alcohols and water.
Choose the most appropriate option.