Final answer:
The molecule-molecular shape pair that matches a molecule with two covalent single bonds and no lone pair on the central atom is B) BeH2, Linear.
Step-by-step explanation:
The student's question relates to determining which molecule-molecular shape pair matches a molecule that has two covalent single bonds and no lone pair on the central atom. Analyzing the given options, we know that any molecule with only two atoms is linear, as are molecules whose central atom contains only two electron groups and orients those groups 180° apart for minimal repulsion, leading to a linear molecular shape. Considering this, BeH2 (beryllium hydride) is a molecule featuring a central atom with two single covalent bonds and has a linear shape as described. It matches the description because there are only two electron groups around the central beryllium atom with no lone pairs, making it linear.
Therefore, the correct answer is B) BeH2, Linear.