Which sentence best creates emphasis specifically on water safety through the use of a split infinitive?

A split infinitive places a word between “to” and the verb. In C, “closely” comes between “to” and “watch,” and it emphasizes the careful supervision needed for water safety. D also uses a split infinitive (“to really watch”), but “really” is less specific than “closely” about how to keep the children safe.

AI-written and checked against the verified answer.