Answer:
A. 9 months
Step-by-step explanation:
We are given that,
Initial members in the club = 350
Rate of growth of the members = 4% = 0.04
<em>Since, the exponential growth function is given by
, where a= initial value and r= rate of increase and x= time.</em>
Substituting the values, we have,
Number of increase in the members after 'x' months is,

Now, the number of months when the number of members is 500 is,

<h3>That is, after 9 months, the number of members will be 500.</h3>
So, option A is correct.