Final answer:
Based on the question, SiH4 (assumed from 'SIHA') has a tetrahedral shape, which generally occurs when there are four bonding electron pairs around the central atom. However, the molecular formula 'SIHA' is not standard, and the other given molecules have different shapes or are invalid as written.
Step-by-step explanation:
The student asked which of the following molecules has a tetrahedral shape: A. BC₂ B. SIHA C. H₂O D. PCIE. Among the choices given, the typo 'SIHA' seems to refer to SiH4, which is known to have a tetrahedral molecular geometry. Tetrahedral molecular shapes occur when a central atom is surrounded by four bonding electron pairs without any lone pairs, as seen in methane (CH4). However, given that 'SIHA' is not a standard chemical notation, this interpretation might be incorrect if 'SIHA' stands for a different compound. It is also worth noting that water (H2O) has a bent shape due to the two lone pairs on the oxygen, and the shapes of the other given options are either invalid or incorrectly represented chemical formulas.