How many times did the U. S. try to "open trade" with Japan?

Following continuing attempts by Europeans to convert the Japanese to Catholicism, Japan cut off nearly all outside contact in 1639. For more than 200 years, Japan permitted trade only with Dutch and Chinese ships bearing special charters.

Explanation:

the answer to your question is,

d. when a child was born.

-mabel < 3

answer; no longer than a reasonable period of time;