How do you know when to add numbers? what is the sign rule

Which of the following identifies a main culprit for america’s increasing weight gain

Which of the following statements describes the lysogenic cycle of lambda (λ) phage? a) after infection, the viral genes immediately turn the host cell into a lambda-producing factory, and the host cell then lyses.b) most of the prophage genes are activated by the product of a particular prophage gene.c) the phage genome replicates along with the host genome.d) the phage dna is copied and exits the cell as a phage.

This is a negative reaction to food that doesn’t involve the immune system