Which of the following oxides is the most amphoteric?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $R :$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy,when one moves from left to right in a period.
In the light of the above statements,choose the most appropriate answer from the options given below :

Which of the following is the correct order of acidic strength?

Based on the provided periodic table segment,identify the correct statement regarding the oxide of element $X$. The element with atomic number $Z = 52$ is Tellurium $(Te)$.

In the following,the element with the highest electropositivity is

Which properties in a period indicate the chemical reactivity of elements?