Final answer:
The demand that was not part of the Women's Strike for Equality and not a founding goal of NOW was to decriminalize the use of birth control, as birth control was already legal by the time of the protests following the 1965 Griswold v. Connecticut decision.
Step-by-step explanation:
The question relates to the demands made by the women's movement during the 1960s and 1970s. Concerning the choices presented in the question, it is important to note that during the Women's Strike for Equality, there were several key demands including employment discrimination, political equality, abortion, free childcare, and equality in marriage. Therefore, based on historical context given regarding the National Organization for Women (NOW) foundational goals, the demand which was not part of the women's strike, and thus not a founding goal of NOW as per the provided choices, would be to decriminalize the use of birth control (C). This was because the use of birth control was already legal following the Griswold v. Connecticut Supreme Court decision in 1965.