For your info, the answers A, B, C, D represents the DOMAIN and not te RANGE. However find here below the DOMAIN & te RANGE
f(x) = log₇(x). Whatever is the base, the domain is x>0 and the ASYMPTOTE
is x=0. Hence the DOMAIN is x>0 (answer C)
Regarding the range their is no limitation and the range is:
-∞ <y< +∞
or
Range = {y / y ∈ R}