Question

a hypothesis is often written using the words...
\if\ and \then\.
\if\ and \them\ and \because\,
\if\ and \when\,
\if\ and \then\ and \because\.

Explanation:

In scientific method and hypothesis formulation, a hypothesis typically has an "if - then" structure to state a condition and its predicted outcome. The other options have incorrect wordings (like "them" instead of "then" in one, or unnecessary "because" or "when" which are not standard for basic hypothesis structure).

Answer:

A. "if" and "then"