How to boogie board<br>Choose a calm spot for boogie boarding. Go to a swimming beach that has waves less than 2 ft (61 cm) high. Make sure that the beach is free of large rocks, boats, and fishing equipment.
Beaches with wave less than 1 ft high are good for boogie boarding
It is correct because it says boogie boarding is good for beaches with waves less than 2 ft high. Therefore 1ft high is good as well. The system thinks it has to be less than 2, and doesn't recognize less than 1 would work as well
( z1 beach :ARG0-of ( z2 have :ARG1 ( z3 wave :ARG1-of ( z4 high :ARG2 ( z5 less-than :op ( z6 distance-quantity :quant 1 :unit ( z7 foot ) ) ) ) ) ) )