Answer: The correct answer is option A.
Explanation:
A compound is defined as the substance in which two different elements combine in a fixed ratio. Example: [tex]H_2O, CO_2[/tex] etc..
An element is defined as the simplest substance having same type of atoms. Example: Carbon (C), Oxygen (O) etc..
Allotrope is defined as a property of some elements in which they are exist in different physical forms. Examples: Allotropes of carbon are graphite, diamond etc..
In a given image, the molecule is made up of two different types of elements which are hydrogen and carbon. Hence, it is termed as a compound named as ethane.
Thus, the correct answer is Option A.