Answer:
Both B and C are correct.
Step-by-step explanation:
In any case, you want the OR (age ≥ 18) in there, because that makes the expression true for people 18 and up. So that already disqualifies answer D.
The most precise answer is B, since it literally states the requirements.
A is incorrect, because learners can be 1 as well, and the age can be 18 as well, so you need ≥ in stead of >.
C is interestingly also correct. The left hand side of the OR would be true for ages over 16 or 17, but that's OK in this case.