Which of the following oxides is the most acidic?

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

Given below are two statements:
Statement $I$: The number of pairs among $[Al_2O_3, Cr_2O_3]$,$[Cl_2O_7, Mn_2O_7]$,$[Na_2O, V_2O_3]$ and $[CO, N_2O]$ that contain oxides of same nature (acidic,basic,neutral or amphoteric) is $4$.
Statement $II$: Among $Na_2O, Al_2O_3, CO$ and $Cl_2O_7$,the most basic and acidic oxides are $Na_2O$ and $Cl_2O_7$,respectively.

The correct sequence of acidic character is:

Given below are two statements:
Statement $I$: Chlorine can easily combine with oxygen to form oxides,and the product has a tendency to explode.
Statement $II$: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens.
In the light of the above statements,choose the correct answer from the options given below.

Explain the periodic properties of elements and their reactivity trends in the periodic table.