The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Plants for which flower initiation is light-dependent have a critical day-length associated with them. Tobacco is a short day plant meaning that they flower in response to long periods of night darkness when day lengths are less than the critical photoperiod. So, a farmer does not prefer to grow tobacco plant under a long day, as they will not flower under such conditions. So, the correct option is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.