Maria’s fellow professor asked her to teach an honors class in the spring. Maria agreed only to find out after agreeing that teaching such a course also meant that she would have to attend meetings of the honors professors, go to honors-oriented conventions, and take on special advising duties. Maria had fallen victim to the technique.

The answer is the low-balling technique.

Explanation:

This persuasion technique occurs when a person requests an apparently small favour, but initially withholds information that could make the person requested to decline.

Another example takes place in business: a customer might offer an initially low price, only to raise the payment later (what he actually intended to pay) and make the seller think the profit was higher.

the answer your looking for is c. : )