Key Concept: Rice tungro disease needs a specific insect vector to spread between plants.
Why it's correct: Nephotettix virescens, the green leafhopper, feeds on infected rice and transmits the tungro virus complex (RTBV + RTSV) to healthy plants during subsequent feeding.
Why others fail: Nilaparvata lugens, Sogatella furcifera, and Laodelphax striatellus are all rice-feeding hoppers, but each is linked to different rice diseases, not tungro.