Answer:
Option A is correct
Explanation:
domain is the value of x in a given interval. In the given graph we can see that function lies from 0 to infinite.
Hence, x can take all values from 
Option B is incorrect because graph is not varying in the interval 
Option C is incorrect because real number contains all numbers from negative axis to positive whereas this graph only lies in positive x-axis
Option D is Incorrect because y is extended after 10 also so it is not lying in the interval 