Final answer:
The symptom of insecticide poisoning to watch for if exposed while working in a citrus grove is muscle tremors. These can be accompanied by other symptoms such as salivation, convulsions, and involuntary urination.
Step-by-step explanation:
If you have been accidentally exposed to an insecticide while working in a citrus grove, the symptom of poisoning to watch for from the options provided is C) Muscle tremors. Insecticide poisoning, particularly with organophosphates, can lead to symptoms such as muscle tremors, as well as constriction of pupils, profuse salivation, convulsions, and involuntary urination and defecation.
The severity of symptoms can depend on the type, dose, method, and duration of exposure. Other potential symptoms not listed in the options but associated with organophosphate poisoning include headache, dizziness, nausea, and in severe cases, respiratory failure or death.