Which of the following is most suitable to fill the blank C? The nation has…

Which of the following is most suitable to fill the blank C?

The nation has recently _________ (A) a surge in fake bomb threats targeting trains and flights, creating panic among passengers and disrupting essential travel services. Anonymous calls and messages falsely claimed the _________ (B) of explosives, forcing authorities to carry out emergency checks. These incidents led to delays, cancellations, and inconvenience for thousands of travelers. Union government ministers confirmed that detailed information about the threats had been _________ (C) and stressed that such false alarms are treated as serious crimes. They noted that spreading fake information not only causes fear but also _________ (D) security resources and diverts attention from genuine concerns. Investigations are underway to _________ (E) the sources of these false alerts. Early indications point to organized attempts to spread chaos. Officials assured that once the responsible organization is identified, strict punishment will be _________ (F) under existing laws. The government has also directed railways and aviation authorities to step up security measures and verify all suspicious communications without delay. While no actual explosives have been discovered, the gravity of the threats cannot be ignored. Passengers are advised to remain calm and cooperate with security checks, as the government reiterated its commitment to ensuring safety and penalizing those spreading fake threats.