According to the information in the article, which of the following happened in the experiment conducted by Rachel Collin and…

Male slipper limpets of differing sizes were placed in cups of differing sizes.

Some pairs of male slipper limpets were prevented from making any kind of physical contact with each other.

Some pairs of male slipper limpets were placed in small cups and some were placed in large cups.

Only certain pairs of male slipper limpets were allowed to use the same water.

Rachel Collin and Allan Carrillo-Baltodano were more interested in the results of physical contact between male slipper limpets than in the results of nonphysical contact.