Q. A demonstration is . . . . . . . . act of showing by giving proof or evidence.
✅ Correct Answer: (B)
an
Explanation: 'A/an' is used with singular noun. 'An' article will be used here as the word begins with vowel sound.
Explanation by: Mr. Dubey
'A/an' is used with singular noun. 'An' article will be used here as the word begins with vowel sound.