For the first two weeks of a human pregnancy, the developing organism is referred to as a(n)

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The question asks: for the first two weeks of a human pregnancy, the developing organism is referred to as a(n) zygote.
Since fertilization marks the creation of a single cell called the zygote, and the initial rapid cell divisions (cleavage) happen during the first days after fertilization, many textbooks describe the early embryo up through the first week as the zygote. 
As development proceeds, the zygote becomes a morula and then a blastocyst as it travels toward and implants into the uterine wall; however, these transitions occur within or after the first two weeks depending on terminology. 
Because the prompt specifies the first two weeks, identifying the term as zygote aligns with the classic stage immediately following fertilization before significant differentiation and the later morula/blastocyst stages occur. 
If there were other options, we would evaluate them by noting that later terms (morula, blastocyst, embryo) refer to later phases of pre-implantation development or post-implantation development, not the initial two-week window. 
In this particular item, the supplied answer identifies the zygote as the correct term for that early period, and the reasoning above supports that classification. 
Be mindful that some sources differentiate stages slightly by timeline (e.g., zygote vs. morula versus blastocyst), but for the requested two-week window, zygote is the conventionally correct label in many educational contexts.

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For the first two weeks of a human pregnancy, the developing organism is referred to as a(n)

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