∈ <--- This symbol means "an element of". According to your question, you would like to know if statement h ∈ K is valid. That statement is true because the letter "h" is a consonant and set K is a set of consonants. If we look at set K, it should look like this:
K = {B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z}. As seen in this set, the letter "h" is the 6th element.
Therefore, h ∈ K is a valid statement. The answer is: TRUE.