Option 1 -> The text doesn't indicate disapproval; he simply remained silent.
Option 2 -> While he was silent, his silence had a purpose - avoiding arguments.
Option 3 -> He was described as "silent" and kept his peace, showing no active involvement.
Option 4 -> He "kept his peace to avoid argument," indicating he chose not to interfere to prevent family conflict.
Hence, Option 4 -> The passage explicitly states "My father probably kept his peace to avoid argument," which shows he deliberately chose silence to maintain harmony between the mother (who wanted the child to dance) and potentially the child's reluctance, rather than creating conflict or taking sides -> correct