The term "carolingian dynasty" generally refers to the reign of

Frankish noble family founded by Charles Martel with origins in the Arnulfing and Pippinid clans of the 7th century AD.

the answer is option a.

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.