Common polyphagous crop pests are:

Correct option is B

· Polyphagous pests are those that feed on multiple plant species and are not host-specific.
· Cotton bollworm (Helicoverpa armigera) is a major polyphagous pest affecting multiple crops, including cotton, pigeon pea, chickpea, tomato, and sunflower.
· Brinjal shoot and fruit borer is a monophagous pest, meaning it primarily attacks brinjal, and is therefore not polyphagous.
· Potato tuber moth primarily affects potato crops and is not considered polyphagous.
· Red hairy caterpillar attacks multiple crops, making it a polyphagous pest.