When your form is multi-step, you can use the "Jump to" option in the logic to show or hide the next question based on previous answers.
If your question is a multi-choice field, you should add a condition for each option.
For example, you want to show the email field if the answer to the multi-choice question is option 1 and option 2. So the logic is:
if the answer is option 1,
and
if the answer is option 2
jump to
email field
When writing the logic, it is important to consider that the logic rules should not overlap with each other, and for different scenarios, avoid using the same logic.