In which month is the Inter Tropical Convergence Zone (ITCZ) located around 20°N-25°N latitude (over the Gangetic plain)?

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Step 1: The Inter Tropical Convergence Zone (ITCZ) is the zone of low pressure near the thermal equator where trade winds converge.

Step 2: The ITCZ migrates seasonally following the sun/thermal equator toward the hemisphere experiencing summer. During the Northern Hemisphere summer it moves northward.

Step 3: Although the sun is overhead at the Tropic of Cancer ($\approx 23.5^\circ$N) around 21 June, the monsoon circulation and the ITCZ (monsoon trough) over the Indian subcontinent reach their characteristic position over the Gangetic Plain a bit later, typically in July.

Conclusion: The ITCZ is located around $20^\circ$N–$25^\circ$N (over the Gangetic plain) in July, so the correct option is (4) July, i.e., choice d.

FINAL_ANSWER: d

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