Without seeing the photograph, I can provide general information about the developments that took place under the Gupta Empire. However, based on the options you provided, if the image illustrates significant artistic achievements or architectural structures, it would likely represent "advances in art and engineering".
If the photograph shows numerical systems or mathematical achievements, it might indicate "contributions to the decimal system." If it features metalwork or related artifacts, it would reflect "advances made in metallurgy." Lastly, if it pertains to religious themes associated with Buddhism, it would suggest "the renewed importance of Buddhism."
Please clarify or provide more context regarding the photograph for a more precise answer.