Controlling text/html vs text/plain

When archiving a message which contains a multiplart/alternative
which contains a text/html and text/plain parts, what's the
configuration for MHonArc to pick the text/plain part and ignore the
text/html?

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J C Lawrence                                 Home: claw(_at_)kanga(_dot_)nu
----------(*)                              Other: coder(_at_)kanga(_dot_)nu
--=| A man is as sane as he is dangerous to his environment |=--