How many $S-OH$ bonds are present in Caro's acid?

Which of the following diagrams is correct for the change of sulphur compounds?

Below are two statements. One is labeled as Assertion $(A)$ and the other as Reason $(R):$
Assertion $(A):$ $H_2Te$ is more acidic than $H_2S$.
Reason $(R):$ The bond dissociation enthalpy of $H_2Te$ is less than that of $H_2S$.
In the context of the above statements,choose the correct answer from the following options:

Which of the elements of group $16$ has the maximum tendency of catenation?

Bleaching action of $SO_2$ is due to

The highest catenation ability is shown by