Based on the fact that 25% of the offspring inherited two recessive alleles (we know this because in order for a recessive allele to be expressed, it must be homozygous),<u><em> the parent peas had to both be heterozygous. </em></u>
This has to be the most important step to follow in all labs. If your instructor says not to eat or touch something do not do it! Furthermore all of the other answers can be summarized in step B