Final answer:
Emily was sent to a convalescent home due to nightmares and a lack of thriving, relating to the difficult circumstances of her upbringing.
Step-by-step explanation:
In the story 'I Stand Here Ironing', Emily was sent to a convalescent home because she was having nightmares and not thriving. This reason falls under option 1 of the provided choices. Emily's mother struggled to take care of her while managing work and the needs of other siblings, which led to the decision to send Emily away in hopes of better care and alleviation of her health issues.