Why is a clinical trial restricted by ethics? a. it can be performed in a petri dish b. it involves a human patient c. it is done in a test tube d. it is costly and time-consuming

Clinical trials are restricted by ethics because they involve human patients.

B. It involves a human patient

Explanation:

A human life  is much more than just a body to be studied under various conditions. Humans are social  animals and need to socialize, breathe in fresh air, have a nutritious and balanced diet  and a sound sleep in order to live a fruitful life.

Clinical trials are the types of research in which people participate as subjects or hosts  in order to test new treatments, effects and various medical conditions.

Some people also  volunteer to test how certain external conditions effect human body. They are kept in the  conditions which are to be tested for numerous days.  

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explanation:

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).