Solution

Connectors: A: A high-level alert has been sounded in several Indian cities including New Delhi, E: after intelligence reports indicated that about 100 Pakistan-backed terrorists, including Afghans, are set to infiltrate into the country to carry out major attacks in these cities and in Jammu & Kashmir. Connectors: B: U.S. officials have confirmed that Israel was responsible for the bombing of an Iranian. D: weapons depot in Iraq last month, an attack that would mark a significant escalation in Israel's years-long campaign against Iranian military entrenchment across the region Connectors: C: The Kartarpur corridor will connect Darbar Sahib in Pakistan's Kartarpur with Dera Baba Nanak shrine in Gurdaspur district F: and facilitate visa-free movement of Indian Sikh pilgrims, who will have to just obtain a permit to visit Kartarpur Sahib, which was established in 1522 by Guru Nanak Dev.  This relation is shared by only option 3.