Let f be a function defined as f(x) = 2x + log2x over the interval [1, 2]. What conclusion can be made about the value of k such that f(k) = 4?
A
The value of k must be 18.B
The value of k must be between 1 and 2.C
No conclusion can be made about k because 1 < 2 < 4.D
No conclusion can be made about k because f(x) is not continuous over the interval.